例7_1.cpp

c语言书籍&课件&示例代码

#include<stdio.h>
long square(long);//声明函数
void main()
{  long in_num,result;
   printf("Input an integer:");
   scanf("%ld",&in_num);
   result=square(in_num);//函数调用
   printf("The square number of %ld is %ld\n",in_num,result);
}
long square(long x)//函数首部
{  long x_square;//说明部分
   x_square=x*x;//执行部分
   return x_square;
}