实例代码如下：
1 #include<stdio.h> 2 int global_value=9; 3 void change(void) 4 { 5 global_value=8; 6 } 7 void main() 8 { 9 printf("before: global_value=%d",global_value ); 10 printf("\n"); 11 change(); 12 printf("after: global_value=%d",global_value); 13 14 }
运行结果：
before: global_value=9
after: global_value=8
Process returned 23 (0x17) execution time : 0.480 s
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