8.21.file1.c

c入门代码大全

//file1.c：用extern将外部变量的作用域扩展到其它文件
 #include<stdio.h>
 int A;
 int main()
 {
     int power(int);
     int b=3,c,d,m;
     printf("enter the number a and its power m:\n");
     scanf("%d%d\n",&A,&m);
     c=A*b;
     printf("%d*%d=%d\n",A,b,c);
     d=power(m);
     printf("%d**%d\n",A,m,d);
     getchar();
 }