实验一

#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() {
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 = %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 = 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;
}

　　

 

 line7：n*(n+1)/2

line8：n*(n+1)/2

line9:n*(n+1)/2

line10:2n/(n+1)

原因：整型数据除法运算结果会舍去余数

 

#include <stdio.h>
int main()
 {
printf(" O \t O\n");
printf("<H> \t  <H>  \n");
printf("I I \t I I\n");

#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;
}

　　

 

return 0; }

　　

 

#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;
 
}