#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>#define MAX_PATH   256
char filename[MAX_PATH + 5];
int main(int argc, char** argv)
{//数字字符串转数字const  char* kk = "689";int zhi = atoi(kk) + 8;//数字字符串转doubledouble zhi2 = atof(kk) + 2;printf("result : %f \n", zhi2);//数字转字符串int nn = 58;char zu[20];snprintf(zu,20, "%d", nn);printf("%d-----%d-----%s", sizeof(zu),strlen(zu),zu);getchar();return 0;
}

结果: 

FR：徐海涛(hunkxu)