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(" o \n");
    printf("<H> \n");
    printf("I I \n");
    printf("\n");
    printf(" o \n");
    printf("<H> \n");
    printf("I I \n");
    return 0;
}



#include<stdio.h> 
int main(){
    printf(" o \t o\n");
    printf("<H> \t<H>\n");
    printf("I I \tI I\n");
    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 n,r1,r2,r3,r4;
    n = 100;
    r1 = n*(n+1)/2;
    r2 = (n+1)*n/2;
    r3 = n/2*(n+1);
    r4 = (n+1)/2*n;
    printf("n = %d\n",n);
    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(){
    int n,r1,r2,r3,r4;
    n = 101;
    r1 = n*(n+1)/2;
    r2 = (n+1)*n/2;
    r3 = n/2*(n+1);
    r4 = (n+1)/2*n;
    printf("n = %d\n",n);
    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(){
    int a1,a2,a3;
    char c1,c2,c3;
    double x,y;
    scanf("%d%d%d",&a1,&a2,&a3);
    printf("%d,%d,%d\n",a1,a2,a3);
    scanf("%c%c%c",&c1,&c2,&c3);
    printf("%c%c%c\n",c1,c2,c3);
    scanf("%lf,%lf",&x,&y);
    printf("%f,%f",x,y);
    return 0;
}




#include<stdio.h> 
int main(){
    int a1,a2;
    char c1,c2;
    scanf("%d%c%d%c",&a1,&c1,&a2,&c2);
    printf("a1 = %d,a2 = %d\n",a1,a2);
    printf("c1 = %c,c2 = %c\n",c1,c2);
    return 0;
}




#include<stdio.h>
int main(){
    int answer;
    char words[5000];
    printf("网课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("网当遇到问题时,你会选择:\n");
    printf("1.遇到问题,就解决问题。不懂的,探索式学习,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;
}






#include<stdio.h>
int main(){
    int answer;
    char words[5000];
    printf("网课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");
    
        gets ( words );
    }
    printf("\n");
    printf("网当遇到问题时,你会选择:\n");
    printf("1.遇到问题,就解决问题。不懂的,探索式学习,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");
    
        gets ( words );
    }
    return 0;
}






#include<stdio.h>
int main()
{
    int answer;
    char words[5000];
    printf("你喜欢宠物吗？\n");
    printf("1.喜欢\n");
    printf("2.不喜欢\n") ;
    scanf("%d",&answer);
    if (answer == 1){
        printf("你喜欢猫还是狗或是其它？\n");
        getchar();
        gets (words);
    }
    else if(answer == 2){
        printf("为什么呢？\n");
        getchar();
        gets (words);
    }
    return 0;
}