#include <stdio.h>//sprintf

#include <stdlib.h>//atof,atol,strtod,strtol

using namespace std;

int main(){

    //字符串转数值

    printf("%f\n", atof("23"));//23.000000

    printf("%d\n", atol("23"));//23

    printf("%f\n", strtod("23.00", NULL));//23

    printf("%d\n", strtol("23.00$$$$", NULL, 10));//23

    //数值转字符串

    char tmp[10];

    int i = 67;

    sprintf(tmp, "%d", 89);//将数值转字符串

    printf("%s\n", tmp);//89

    sscanf( tmp, "%d", &i ); // 将字符串转换成整数 i = 15

    printf("%s-%d\n", tmp, i);//89-89

}