#include <stdio.h>int main (){/* 局部变量声明 */int a, b;int c;/* 实际初始化 */a = 10;b = 20;c = a + b;printf ("value of a = %d, b = %d and c = %d\n", a, b, c);return 0;}
#include <stdio.h>/* 全局变量声明 */int g;int main (){/* 局部变量声明 */int a, b;/* 实际初始化 */a = 10;b = 20;g = a + b;printf ("value of a = %d, b = %d and g = %d\n", a, b, g);return 0;}
#include <stdio.h>/* 全局变量声明 */int g = 20;int main (){/* 局部变量声明 */int g = 10;printf ("value of g = %d\n", g);return 0;}
#include <stdio.h>/* 全局变量声明 */int a = 20;int main (){/* 在主函数中的局部变量声明 */int a = 10;int b = 20;int c = 0;int sum(int, int);printf ("value of a in main() = %d\n", a);c = sum( a, b);printf ("value of c in main() = %d\n", c);return 0;}/* 添加两个整数的函数 */int sum(int a, int b){printf ("value of a in sum() = %d\n", a);printf ("value of b in sum() = %d\n", b);return a + b;}
