C语言经典弱智问题解法整理

<1>交换

//1)输入输出#include<stdio.h>int main(void){int a, b;scanf("%d %d", &a, &b);printf("%d %d\n", b, a);return 0;}

//2)第三变量#include<stdio.h>int main(void){int a, b, t;scanf("%d %d", &a, &b);t = a; a = b; b = t;printf("%d %d\n", a, b);return 0;}

//3)加减法#include<stdio.h>int main(void){int a, b;scanf("%d %d", &a, &b);a = a + b;b = a - b;a = a - b;printf("%d %d\n", a, b);return 0;}

//4)乘除法#include<stdio.h>int main(void){int a, b;scanf("%d %d", &a, &b);a = a*b;b = a/b;a = a/b;printf("%d %d\n", a, b);return 0;}

//5)异或运算#include<stdio.h>int main(void){int a, b;scanf("%d %d", &a, &b);a ^= b ^= a ^= b;printf("%d %d\n", a, b);return 0;}

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<2>两数相加

//1)加法运算#include<stdio.h>int main(){int a, b;scanf("%d %d",&a, &b);printf("%d\n",a+b);return 0;}

//2)逻辑运算#include <stdio.h>int add(int a ,int b){if(a==0) return b;return add((a&b)<<1, (a^b));}  int main(){    int a ,b;    scanf("%d %d",&a,&b);    printf("%d\n", add(a,b));    return 0;}

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<3>待更新

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