实验1 C语言开发环境使用和数据类型、运算符、表达式

#include<stdio.h>
int main(){
    
    printf("hello,c\n");
    
    printf("my stuno is:2020XXXXXX\n");
    printf("2020,r u crazy?\n");
    
    return 0;
}

 

#include<stdio.h>
int main(){
    while(1)
        printf("ww");
        
    return 0;
}

#include<stdio.h>
int main(){
    while(0)
        printf("1 0");
        
    return 0;
}

#include<stdio.h>
int main(){
    
    int x, y;
    int r1, r2, r3, r4;
    
    x=1;
    y=2;
    
    r1 = x + y;
    r2 = x - y;
    r3 = x * y;
    r4 = x / y;
    
    printf("r1 = %d\n", r1);
    printf("r2 = %d\n", r2);
    printf("r3 = %d\n", r3);
    printf("r4 = %d\n", r4);
    
    return 0;
}

#include<stdio.h>
int main(){
    
    float x, y;
    float r1, r2, r3, r4;
    
    x=1;
    y=2;
    
    r1 = x + y;
    r2 = x - y;
    r3 = x * y;
    r4 = x / y;
    
    printf("r1 = %f\n", r1);
    printf("r2 = %f\n", r2);
    printf("r3 = %f\n", r3);
    printf("r4 = %f\n", r4);
    
    return 0;

#include<stdio.h>
int main(){
    int answer;
    char words[5000];
    
    printf("在家上学让一些人欢喜一些人忧.\n");
    printf("1.作为一个宅，社恐，觉得这样很好，有网络，自主学习，很ok.\n");
    printf("2.不喜，不喜，很不喜，眼睛快瞎了，脑壳有点卡...\n");
    printf("3.中间派，不知道，说不清.\n");
    printf("4.其它...\n");
    printf("你的选择：");
    scanf("%d", &answer);
    if(answer ==4){
        printf("请补充说明你的想法：\n");
        getchar();
        gets(words);
    
    }
    
    printf("\n");
    printf("当遇到问题时，你会选择：\n");
    printf("1.遇到问题，就解决问题，不懂的，搜索式学习，逐个攻破.\n");
    printf("2.遇到问题，不高兴。然后，...，没有了.\n");
    printf("3.其它...\n");
    printf("你的选择：");
    scanf("%d", &answer);
    
    if(answer ==1)
        printf(":)\n");
    else if(answer == 2)
        printf("这样不能解决问题啊...我们选择1好不好：）\n");
    else if(answer == 3){
        printf("请补充说明你的想法：\n");
        getchar();
        gets(words);
    
    }
    
    
    return 0;
}