内容概要
一、函数的传参都是值传入
#include <stdio.h>void swap(int,int);void swap(int x, int y){int temp;
printf("in swap x:%d , y:%d\n", x, y);
temp = x;
x = y;
y = temp;
printf("in swap x:%d , y:%d\n", x, y);
}int main(){int x = 3, y = 5;
printf("in main x:%d , y:%d\n", x, y);
swap(x,y);
printf("in main x:%d , y:%d\n", x, y); return 0;
}执行结果
in main x:3 , y:5in swap x:3 , y:5in swap x:5 , y:3in main x:3 , y:5
使用指针传入地址，而不是单纯传入值
#include <stdio.h>void swap(int,int);void swap(int *x, int *y){int temp;
printf("in swap x:%d , y:%d\n", *x, *y);
temp = *x;*x = *y;*y = temp;
printf("in swap x:%d , y:%d\n", *x, *y);
}int main(){int x = 3, y = 5;
printf("in main x:%d , y:%d\n", x, y);
swap(&x,&y);
printf("in main x:%d , y:%d\n", x, y); return 0;
}执行结果
in main x:3 , y:5in swap x:3 , y:5in swap x:5 , y:3in main x:5 , y:3
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