实验1 C语言开发环境使用和编程初体验

#include<stdio.h>

int main()
{
    printf(" O\n");
    printf("<H>\n");
    printf("I I\n");

printf(" O\n");
printf("<H>\n");
printf("I I\n");


return 0;


}

 

 

  #include<stdio.h>

int main()
{
printf(" O    O\n");
printf("<H>  <H>\n");
printf("I I  I 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);
    getchar();
    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);
    getchar();
    return 0;
}

 

 第一个变量为整型，余数舍去。第二个是浮点型，保留小数。

#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;
}

 

 加法，乘法，除法。整型数据除法去除余数。

#include<stdio.h>
# pragma warning (disable:4996)
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 %1f", x, y);
        return 0;
}

 

 

#include<stdio.h>
#pragma warning(disable:4996)
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("网课学习让有些人欢喜有些人忧.\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.其他...\n");
    printf("你的选择：");
    scanf_s("%d", &answer);
    if (answer == 4) {
        printf("请补充说明你的想法:\n");
        getchar();
        gets_s(words);
    }
    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.其他....\n");
    printf("你的选择：\n");
    scanf_s("%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_s(words);
    }
    return 0;

}

 

 

getchar()不是只能输入一个字符吗？运行的时候可以输入一串字符。