将字符数字转换为C中的相应整数

#include<stdio.h>
#include <stdlib.h>

int main() {
    char str_num[] = "123";
    int num = atoi(str_num);
    printf("The integer value of %s is %d\n", str_num, num);
    return 0;
}

#include<stdio.h>

int main() {
    char str_num[] = "123";
    int num;
    sscanf(str_num, "%d", &num);
    printf("The integer value of %s is %d\n", str_num, num);
    return 0;
}