读取一个字符串并通过atoi()函数将其转换为数值。

#include <stdio.h>
#include <stdlib.h>
int main()
{
   int age;
   char years[8];
   printf("How old was James?");
   gets_s(years);
   age=atoi(years);
   printf("James was %d years old./n",age);
   return(0);
}