基本数值类型和字符串的相互转化代码,C代码库,德仔网

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【C】基本数值类型和字符串的相互转化
作者:日拱一卒 / 发布于2014/7/1/ 765

	#include<stdio.h>

	/************************************************************************/
	/* 字符串转数值 */
	/************************************************************************/
	/*去掉首尾无效的&lsquo;0&rsquo;，例如：&ldquo;023.4100&rdquo;改为&ldquo;23.41&rdquo;*/
	void lxh_strNumFormat(char *str);

	/*将字符串转化为无符号短整型*/
	unsigned short lxh_strToUshort(char *str);
	/*将字符串转化为无符号整型*/
	unsigned int lxh_strToUint(char *str);
	/*将字符串转化为无符号长整型*/
	unsigned long lxh_strToUlong(char *str);

	/*将字符串转化为短整型*/
	short lxh_strToShort(char *str);
	/*将字符串转化为整型*/
	int lxh_strToInt(char *str);
	/*将字符串转化为长整型*/
	long lxh_strToLong(char *str);

	/*将字符串转化为浮点型*/
	float lxh_strToFloat(char *str);
	/*将字符串转化为双精度型*/
	double lxh_strToDouble(char *str);
	/*将字符串转化为长双精度型*/
	long double lxh_strToLongDouble(char *str);

	/************************************************************************/
	/* 数值转字符串 */
	/************************************************************************/
	/*将无符号短整型转化为字符串*/
	/*参数说明：num待转化字符串；str：转化结果*/
	void lxh_uShortToStr(unsigned short num, char *str);
	/*将无符号整型转化为字符串*/
	/*参数说明：num待转化字符串；str：转化结果*/
	void lxh_uIntToStr(unsigned int num, char *str);
	/*将无符号长整型转化为字符串*/
	/*参数说明：num待转化字符串；str：转化结果*/
	void lxh_uLongToStr(unsigned long num, char *str);

	/*将短整型转化为字符串*/
	/*参数说明：num待转化字符串；str：转化结果*/
	void lxh_shortToStr(short num, char *str);
	/*将整型转化为字符串*/
	/*参数说明：num待转化字符串；str：转化结果*/
	void lxh_intToStr(int num, char *str);
	/*将长整型转化为字符串*/
	/*参数说明：num待转化字符串；str：转化结果*/
	void lxh_longToStr(long num, char *str);

	/*将浮点型转化为字符串*/
	/*参数说明：num待转化字符串；str：转化结果；strLen：最大串长*/
	void lxh_floatToStr(float num, char *str, unsigned strLen);
	/*将双精度型转化为字符串*/
	/*参数说明：num待转化字符串；str：转化结果；strLen：最大串长*/
	void lxh_doubleToStr(double num, char *str, unsigned strLen);
	/*将长双精度型转化为字符串*/
	/*参数说明：num待转化字符串；str：转化结果；strLen：最大串长*/
	void lxh_longDoubleToStr(long double num, char *str, unsigned strLen);

	/************************************************************************/
	/* 进制转换 */
	/************************************************************************/
	/*void convert2ToX(unsigned long numOld, char *numNew, unsigned radixNew);
	void convertXTo2(unsigned long numOld, char *numNew, unsigned radixOld);
	void convert10ToX(unsigned long numOld, char *numNew, unsigned radixNew);
	void convertXTo10(unsigned long numOld, char *numNew, unsigned radixOld);
	void convert16ToX(unsigned long numOld, char *numNew, unsigned radixNew);
	void convertXTo16(unsigned long numOld, char *numNew, unsigned radixOld);
	void convertXToX(char *numOld, char *numNew, unsigned radixOld, unsigned radixNew);
	*/

	/************************************************************************/
	/* 带格式的八进制和十六进制问题 */
	/************************************************************************/
	/*将类似&ldquo;0X12AF&rdquo;，&ldquo;032&rdquo;这样的字符串转化为unsigned long型数值*/
	/*参数说明：str待转化字符串*/
	unsigned long lxh_strToNumFormal(char *str);
	/*将unsigned long型数值转化为，类似&ldquo;032&rdquo;这样八进制标示的字符串*/
	/*参数说明：num带转化数值，str转化后字符串*/
	void lxh_numToStrFormal8(unsigned long num, char *str);
	/*将unsigned long型数值转化为十进制表示的字符串*/
	/*参数说明：num带转化数值，str转化后字符串*/
	void lxh_numToStrFormal10(unsigned long num, char *str);
	/*将unsigned long型数值转化为，类似&ldquo;0X12AF&rdquo;这样十六进制表示的字符串*/
	/*参数说明：num带转化数值，str转化后字符串*/
	void lxh_numToStrFormal16(unsigned long num, char *str);

	
	/************************************************************************/
	/* 函数实现 */
	/************************************************************************/
	/*去掉首尾无效的&lsquo;0&rsquo;，例如：&ldquo;-023.4100&rdquo;改为&ldquo;-23.41&rdquo;*/
	void lxh_strNumFormat(char *str){
	int dotFlag;
	unsigned i, j, endIndex;

	if(NULL==str || '\0'==str[0]) return;

	i = j = '-'!=str[0] ? 0 : 1;
	for(; str[i]!=0&&str[i]=='0'; i++);

	endIndex = 0; dotFlag = 0;
	for(; '\0'!=str[i];){
	 if(0==dotFlag && '.'==str[i]) dotFlag = 1;
	 if(str[i]!='0' || 0==dotFlag) endIndex = j;
	 str[j++] = str[i++];
	}

	if(str[endIndex]>32 && str[endIndex]!='.') str[endIndex+1] = '\0';
	else str[endIndex] = '\0';
	}

	/*将字符串转化为无符号短整型*/
	unsigned short lxh_strToUshort(char *str){
	unsigned short result;
	unsigned i;
	char temp;

	lxh_strNumFormat(str);

	if(0 == str[0]) return 0;

	result = 0;
	for(i=0; '\0'!=str[i]; i++){
	 temp = str[i];
	 if(temp<'0' || temp>'9') break;
	 result = result*10 + temp-'0';
	}

	return result;
	}

	/*将字符串转化为无符号整型*/
	unsigned int lxh_strToUint(char *str){
	unsigned int result;
	unsigned i;
	char temp;

	lxh_strNumFormat(str);

	if(0 == str[0]) return 0;

	result = 0;
	for(i=0; '\0'!=str[i]; i++){
	 temp = str[i];
	 if(temp<'0' || temp>'9') break;
	 result = result*10 + temp-'0';
	}

	return result;
	}

	/*将字符串转化为无符号长整型*/
	unsigned long lxh_strToUlong(char *str){
	unsigned long result;
	unsigned i;
	char temp;

	lxh_strNumFormat(str);

	if(0 == str[0]) return 0;

	result = 0;
	for(i=0; '\0'!=str[i]; i++){
	 temp = str[i];
	 if(temp<'0' || temp>'9') break;
	 result = result*10 + temp-'0';
	}

	return result;
	}

	/*将字符串转化为短整型*/
	short lxh_strToShort(char *str){
	int signFlag;
	short result;
	unsigned i;
	char temp;

	lxh_strNumFormat(str);

	if(0==str[0] || ('-'==str[0] && 0==str[1])) return 0;

	if ('-' == str[0]) {
	 signFlag = 1;
	 i = 1;
	} else {
	 signFlag = 0;
	 i=0;
	}

	result = 0;
	for(; '\0'!=str[i]; i++){
	 temp = str[i];
	 if(temp<'0' || temp>'9') break;
	 result = result*10 + temp-'0';
	}

	if(1 == signFlag) result = 0-result;

	return result;
	}

	/*将字符串转化为整型*/
	int lxh_strToInt(char *str){
	int signFlag;
	int result;
	unsigned i;
	char temp;

	lxh_strNumFormat(str);

	if(0==str[0] || ('-'==str[0] && 0==str[1])) return 0;

	if ('-' == str[0]) {
	 signFlag = 1;
	 i = 1;
	} else {
	 signFlag = 0;
	 i=0;
	}

	result = 0;
	for(; '\0'!=str[i]; i++){
	 temp = str[i];
	 if(temp<'0' || temp>'9') break;
	 result = result*10 + temp-'0';
	}

	if(1 == signFlag) result = 0-result;

	return result;
	}

	/*将字符串转化为长整型*/
	long lxh_strToLong(char *str){
	int signFlag;
	long result;
	unsigned i;
	char temp;

	lxh_strNumFormat(str);

	if(0==str[0] || ('-'==str[0] && 0==str[1])) return 0;

	if ('-' == str[0]) {
	 signFlag = 1;
	 i = 1;
	} else {
	 signFlag = 0;
	 i=0;
	}

	result = 0;
	for(; '\0'!=str[i]; i++){
	 temp = str[i];
	 if(temp<'0' || temp>'9') break;
	 result = result*10 + temp-'0';
	}

	if(1 == signFlag) result = 0-result;

	return result;
	}

	/*将字符串转化为浮点型*/
	float lxh_strToFloat(char *str){
	int signFlag, dotFlag;
	float result;
	unsigned i, divNum;
	char temp;

	lxh_strNumFormat(str);

	if(NULL==str || 0==str[0]) return 0;

	if ('-' == str[0]) {
	 signFlag = 1;
	 i = 1;
	} else {
	 signFlag = 0;
	 i=0;
	}

	result = 0; dotFlag = 0;
	for(; '\0'!=str[i]; i++){
	 temp = str[i];
	 if('.' ==temp) {
	 dotFlag = 1;
	 divNum = 1;
	 continue;
	 }
	 else if(temp<'0' || temp>'9') break;
	 if(0==dotFlag){
	 result = result*10 + temp-'0';
	 }else{
	 divNum *= 10;
	 result = result + (float)(temp-'0')/divNum;
	 }
	}

	if(1 == signFlag) result = 0-result;

	return result;
	}

	/*将字符串转化为双精度型*/
	double lxh_strToDouble(char *str){
	int signFlag, dotFlag;
	double result;
	unsigned i, divNum;
	char temp;

	lxh_strNumFormat(str);

	if(NULL==str || 0==str[0]) return 0;

	if ('-' == str[0]) {
	 signFlag = 1;
	 i = 1;
	} else {
	 signFlag = 0;
	 i = 0;
	}

	result = 0; dotFlag = 0;
	for(; '\0'!=str[i]; i++){
	 temp = str[i];
	 if('.' ==temp) {
	 dotFlag = 1;
	 divNum = 1;
	 continue;
	 }
	 else if(temp<'0' || temp>'9') break;
	 if(0==dotFlag){
	 result = result*10 + temp-'0';
	 }else{
	 divNum *= 10;
	 result = result + (double)(temp-'0')/divNum;
	 }
	}

	if(1 == signFlag) result = 0-result;

	return result;
	}

	/*将字符串转化为长双精度型*/
	long double lxh_strToLongDouble(char *str){
	int signFlag, dotFlag;
	long double result;
	unsigned i, divNum;
	char temp;

	lxh_strNumFormat(str);

	if(NULL==str || 0==str[0]) return 0;

	if ('-' == str[0]) {
	 signFlag = 1;
	 i = 1;
	} else {
	 signFlag = 0;
	 i = 0;
	}

	result = 0; dotFlag = 0;
	for(; '\0'!=str[i]; i++){
	 temp = str[i];
	 if('.' ==temp) {
	 dotFlag = 1;
	 divNum = 1;
	 continue;
	 }
	 else if(temp<'0' || temp>'9') break;
	 if(0==dotFlag){
	 result = result*10 + temp-'0';
	 }else{
	 divNum *= 10;
	 result = result + (long double)(temp-'0')/divNum;
	 }
	}

	if(1 == signFlag) result = 0-result;

	return result;
	}

	/*将无符号短整型转化为字符串*/
	void lxh_uShortToStr(unsigned short num, char *str){
	unsigned i, j;
	char r;

	if(NULL == str) return;

	j = 0;
	while(num != 0){
	 r = num%10;
	 num = num/10;
	 str[j++] = r+'0';
	}
	str[j--] = '\0';

	for(i=0; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}
	}
	/*将无符号整型转化为字符串*/
	void lxh_uIntToStr(unsigned int num, char *str){
	unsigned i, j;
	char r;

	if(NULL == str) return;

	j = 0;
	while(num != 0){
	 r = num%10;
	 num = num/10;
	 str[j++] = r+'0';
	}
	str[j--] = '\0';

	for(i=0; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}
	}
	/*将无符号长整型转化为字符串*/
	void lxh_uLongToStr(unsigned long num, char *str){
	unsigned i, j;
	char r;

	if(NULL == str) return;

	j = 0;
	while(num != 0){
	 r = (char)(num%10);
	 num = num/10;
	 str[j++] = r+'0';
	}
	str[j--] = '\0';

	for(i=0; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}
	}

	/*将短整型转化为字符串*/
	void lxh_shortToStr(short num, char *str){
	unsigned i, j;
	char r;

	if(NULL == str) return;

	if(num < 0) {
	 str[0] = '-';
	 i = 1; j = 1;
	 num = 0 - num;
	}else{
	 i = 0; j = 0;
	}

	while(num != 0){
	 r = num%10;
	 num = num/10;
	 str[j++] = r+'0';
	}
	str[j--] = '\0';

	for(; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}
	}

	/*将整型转化为字符串*/
	void lxh_intToStr(int num, char *str){
	unsigned i, j;
	char r;

	if(NULL == str) return;

	if(num < 0) {
	 str[0] = '-';
	 i = 1; j = 1;
	 num = 0 - num;
	}else{
	 i = 0; j = 0;
	}

	while(num != 0){
	 r = num%10;
	 num = num/10;
	 str[j++] = r+'0';
	}
	str[j--] = '\0';

	for(; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}
	}
	/*将长整型转化为字符串*/
	void lxh_longToStr(long num, char *str){
	unsigned i, j;
	char r;

	if(NULL == str) return;

	if(num < 0) {
	 str[0] = '-';
	 i = 1; j = 1;
	 num = 0 - num;
	}else{
	 i = 0; j = 0;
	}

	while(num != 0){
	 r = num%10;
	 num = num/10;
	 str[j++] = r+'0';
	}
	str[j--] = '\0';

	for(; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}
	}

	/*将浮点型转化为字符串*/
	void lxh_floatToStr(float num, char *str, unsigned strLen){
	unsigned i, j, dotIndex;
	long zsbf;
	float xsbf;
	char r;

	if(NULL == str) return;

	if(num < 0) {
	 str[0] = '-';
	 i = 1; j = 1;
	 num = 0 - num;
	}else{
	 i = 0; j = 0;
	}

	zsbf = (long)num;
	xsbf = num - zsbf;

	if(0 == zsbf) str[j++] = '0';

	while(zsbf != 0){
	 r = zsbf%10;
	 zsbf = zsbf/10;
	 str[j++] = r+'0';
	}
	dotIndex = j;
	for(j=dotIndex-1; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}

	if(0 == xsbf) {
	 str[dotIndex] = '\0';
	 return;
	} else {
	 str[dotIndex] = '.';
	}

	j = dotIndex+1;
	while(xsbf!=0 && j<strLen){
	 num = (float)(xsbf*10);
	 r = (char)num;
	 xsbf = num - r;
	 str[j++] = r+'0';
	}
	if(j<strLen) str[j] = '\0';
	else str[strLen-1] = '\0';
	}
	/*将双精度型转化为字符串*/
	void lxh_doubleToStr(double num, char *str, unsigned strLen){
	unsigned i, j, dotIndex;
	long zsbf;
	double xsbf;
	char r;
	
	if(NULL == str) return;
	
	if(num < 0) {
	 str[0] = '-';
	 i = 1; j = 1;
	 num = 0 - num;
	}else{
	 i = 0; j = 0;
	}
	
	zsbf = (long)num;
	xsbf = num - zsbf;
	
	if(0 == zsbf) str[j++] = '0';
	
	while(zsbf != 0){
	 r = zsbf%10;
	 zsbf = zsbf/10;
	 str[j++] = r+'0';
	}
	dotIndex = j;
	for(j=dotIndex-1; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}
	
	if(0 == xsbf) {
	 str[dotIndex] = '\0';
	 return;
	} else {
	 str[dotIndex] = '.';
	}
	
	j = dotIndex+1;
	while(xsbf!=0 && j<strLen){
	 num = (float)(xsbf*10);
	 r = (char)num;
	 xsbf = num - r;
	 str[j++] = r+'0';
	}
	if(j<strLen) str[j] = '\0';
	else str[strLen-1] = '\0';
	}
	/*将长双精度型转化为字符串*/
	void lxh_longDoubleToStr(long double num, char *str, unsigned strLen){
	unsigned i, j, dotIndex;
	long zsbf;
	long double xsbf;
	char r;
	
	if(NULL == str) return;
	
	if(num < 0) {
	 str[0] = '-';
	 i = 1; j = 1;
	 num = 0 - num;
	}else{
	 i = 0; j = 0;
	}
	
	zsbf = (long)num;
	xsbf = num - zsbf;
	
	if(0 == zsbf) str[j++] = '0';
	
	while(zsbf != 0){
	 r = zsbf%10;
	 zsbf = zsbf/10;
	 str[j++] = r+'0';
	}
	dotIndex = j;
	for(j=dotIndex-1; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}
	
	if(0 == xsbf) {
	 str[dotIndex] = '\0';
	 return;
	} else {
	 str[dotIndex] = '.';
	}
	
	j = dotIndex+1;
	while(xsbf!=0 && j<strLen){
	 num = (float)(xsbf*10);
	 r = (char)num;
	 xsbf = num - r;
	 str[j++] = r+'0';
	}
	if(j<strLen) str[j] = '\0';
	else str[strLen-1] = '\0';
	}

	/************************************************************************/
	/* TODO：进制转换 */
	/************************************************************************/

	/*将类似&ldquo;0X12AF&rdquo;，&ldquo;032&rdquo;这样的字符串转化为unsigned long型数值*/
	unsigned long lxh_strToNumFormal(char *str){
	unsigned long result = 0;
	unsigned radix, i;
	char temp;

	lxh_strNumFormat(str);

	if(NULL==str || 0==str[0]) return 0;

	if('0' == str[0]){
	 if('x' == str[1] || 'X' == str[1]){
	 radix = 16;
	 i=2;
	 } else {
	 radix = 8;
	 i=1;
	 }
	} else {
	 radix = 10;
	 i = 0;
	}

	for(;'\0' != str[i]; i++){
	 temp = str[i];

	 if(8==radix){
	 if(temp<'0' || temp>'7') break;
	 }
	 else if(10==radix){
	 if(temp<'0' || temp>'9') break;
	 }
	 else if(16==radix){
	 if(temp<'0' || (temp>'9' && temp<'A') || (temp>'F' && temp<'a') || temp>'f') break;
	 }

	 if(temp>='a' && temp<='f') temp = temp-'a'+10;
	 else if(temp>='A' && temp<='F') temp = temp-'A'+10;
	 else temp = temp - '0';

	 result = result * radix + temp;
	}

	return result;
	}

	/*将unsigned long型数值转化为，类似&ldquo;032&rdquo;这样八进制标示的字符串*/
	void lxh_numToStrFormal8(unsigned long num, char *str){
	unsigned i, j;
	char r;

	if(NULL == str) return;

	j = 0;
	while(num != 0){
	 r = (char)(num%8);
	 num = num/8;
	 str[j++] = r+'0';
	}
	str[j] = '0';
	str[j+1] = '\0';

	for(i=0; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}
	}

	/*将unsigned long型数值转化为十进制表示的字符串*/
	void lxh_numToStrFormal10(unsigned long num, char *str){
	unsigned i, j;
	char r;

	if(NULL == str) return;

	j = 0;
	while(num != 0){
	 r = (char)(num%10);
	 num = num/10;
	 str[j++] = r+'0';
	}
	str[j--] = '\0';

	for(i=0; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}
	}

	/*将unsigned long型数值转化为，类似&ldquo;0X12AF&rdquo;这样十六进制表示的字符串*/
	void lxh_numToStrFormal16(unsigned long num, char *str){
	unsigned i, j;
	char r;

	if(NULL == str) return;

	j = 0;
	if(0 == num) str[j++] = '0';
	while(num != 0){
	 r = (char)(num%16);
	 num = num/16;
	 if(r>9) str[j++] = r-10+'A';
	 else str[j++] = r+'0';
	}
	str[j++] = 'X';
	str[j] = '0';
	str[j+1] = '\0';

	for(i=0; i<j; i++,j--){
	 r = str[i]; str[i] = str[j]; str[j] = r;
	}
	}
试试其它关键字
　基本数值类型　　字符串　
同语言下
可能有用的
日拱一卒贡献的其它代码(1)
.基本数值类型和字符串的相互转化