c语言中函数体中的变量声明不能使用和形参相同的变量名

 

001、

[root@PC1 test]# ls
test.c
[root@PC1 test]# cat test.c
#include <stdio.h>int max(int a, int b)                                   // 创建一个名为max的函数
{int k = 100;if(a > b){return a;}else{return b;}
}int main(void)
{int x, y;puts("please input two integers.");printf("x: "); scanf("%d", &x);printf("y: "); scanf("%d", &y);printf("the large is %d\n", max(x,y));return 0;
}
[root@PC1 test]# gcc test.c -o kkk
[root@PC1 test]# ls
kkk  test.c
[root@PC1 test]# ./kkk
please input two integers.
x: 87
y: 34
the large is 87

 。

 

002、

[root@PC1 test]# ls
test.c
[root@PC1 test]# cat test.c           ## 测试程序
#include <stdio.h>int max(int a, int b)                 // 创建一个函数max
{int a = 100;                  //声明一个和形参同名的变量if(a > b){return a;}else{return b;}
}int main(void)
{int x, y;puts("please input two integers.");printf("x: "); scanf("%d", &x);printf("y: "); scanf("%d", &y);printf("the large is %d\n", max(x,y));return 0;
}
[root@PC1 test]# gcc test.c -o kkk                            ## 程序无法正常编译
test.c: In function ‘max’:
test.c:5:6: error: ‘a’ redeclared as different kind of symbolint a = 100;^
test.c:3:13: note: previous definition of ‘a’ was hereint max(int a, int b)^

 。