c语言程序块中初始化变量对同名变量作用域的影响

 

001、

[root@PC1 test1]# ls
test1.c  test2.c
[root@PC1 test1]# cat test1.c
#include <stdio.h>

int main(void)
{
        int i;
        int x = 10000;
        for(i = 0; i < 4; i++)
        {
                int x = i * 5;
                printf("x = %d\n", x);
        }
        printf("x = %d\n", x);
        return 0;
}
[root@PC1 test1]# cat test2.c
#include <stdio.h>

int main(void)
{
        int i;
        int x = 10000;
        for(i = 0; i < 4; i++)
        {
                x = i * 5;
                printf("x = %d\n", x);
        }
        printf("x = %d\n", x);

        return 0;
}
[root@PC1 test1]# gcc test1.c -o kkk
[root@PC1 test1]# gcc test2.c -o mmm
[root@PC1 test1]# ls
kkk  mmm  test1.c  test2.c
[root@PC1 test1]# ./kkk
x = 0
x = 5
x = 10
x = 15
x = 10000
[root@PC1 test1]# ./mmm
x = 0
x = 5
x = 10
x = 15
x = 15

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