实验1 C语言开发环境使用和数据类型、运算符、表达式

 

实验结论

1.实验任务1

 

#include<stdio.h>
int main(){
	printf(" 0 \n");
	printf("<H>\n");
	printf("I I\n");
	printf("\n");
	printf(" 0 \n");
	printf("<H>\n");
	printf("I I\n");
	return 0;
}

　　

 

#include<stdio.h>
int main(){
    printf(" 0 ");printf("      0 \n");
    printf("<H>");printf("     <H>\n");
    printf("I I");printf("     I I\n");
    printf("\n");
    
    return 0;
}

 

2.实验任务2

#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;
}

 第一次为整型，小数部分舍去；第二次为浮点型，小数部分保留

 

3.实验任务3

#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;
}

 

(n+1)*n/2

(n+1)*n/2

(n+1)*(n/2)

(n+1)/2*n

 

（）的优先级高于*和/，整型会舍去小数部分使计算结果不同

 

4.实验任务4

#include<stdio.h>
int main(){
    
    double x,y;
    char c1,c2,c3;
    int a1,a2,a3;
    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("%lf,%lf\n",x,y);
    
    return 0;
}

 

5.实验任务5

#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;
}

 

6.实验任务6

#include<stdio.h>
int main(){
    int answer;
    char words[5000];
    
    printf("网课学习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;
    
}

 

实验总结

空格很重要，不能乱用

各种数据类型还需要记忆练习