实验2 C语言分支语句、循环语句、 应用编程

#include<stdio.h>
int main() {

    int num;
    scanf("%d", &num);
    printf("2049%04d\n", num);

    scanf("%d", &num);
    printf("2049%04d\n",num);

    scanf("%d", &num);
    printf("2049%04d\n", num);

    return 0;
}

 

#include<stdio.h>
int main() {
    int num;

    while (scanf("%d", &num) != EOF)
        printf("2049%04d\n", num);
    return 0;
}

格式控制符%04d的作用：输出是以4个字符的整形输出，未达到的位都以0来补充。

 

#include<stdio.h>
int main() {
char ans1, ans2;

printf("复习了没?(输入y或Y表示复习了，输入n或N表示没有复习)：");
ans1 = getchar();

getchar();

printf("\n动手敲代码了没？(输入y或Y表示敲了，输入n或N表示没敲)：");
ans2 = getchar();

if ((ans1=='y'|| ans1=='Y')&&(ans2=='y'||ans2=='Y'))
printf("\n罗马不是一天建成的:)\n");
else
printf("\n罗马不是一天毁灭的。。。\n");
return 0;

}

 

 

 

#include<stdio.h>
int main() {
    char x;
    x = getchar();
    if (x>='0'&&x<='9')
        printf("%c是数字字符\n",x);
    else if (x>='a'&&x<='z'||x>='A'&&x<='Z')
        printf("%c是英文字母",x);
    else
        printf("%c是其它字符\n",x);
    return 0;
}

 

 

#include<stdio.h>
int main() {
    int n, a,i;
    double sum;
    while (scanf("%d%d",&n,&a) != EOF)
    {
        printf("n=%d,a=%d", n, a);
        sum = 0;
        for (i = 1; i <= n; i++)
        {
            sum += i / (double)a;
            a = 10 * a + a;
        }
        printf(",sum=%f\n",sum);
    }
    return 0;
}

 

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
const int N = 5;
int main() {
    int x, n;

    srand(time(0));
    for (n = 1; n <= N; n++) {
        x = rand() % 100;
        printf("%3d", x);
    }
    printf("\n");
    return 0;
}

 

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main() {
    printf("猜猜2021年12月哪一天会是你的lucky day\n");
    printf("\n");
    int x, n,a=0;
    srand(time(0));
    loop: x = rand() % 32;
    if (x == 0) goto loop;
        printf("开始喽，你有三次机会，猜吧（1~31）:");
       while(scanf("%d",&n)!=EOF) {
            a++;
            if (n == x) {
                printf("\n");
                printf("恭喜你，猜对了"); break;
            }
            else if (n < x) {
                printf("\n");
                if (a <= 2)
                {   
                    printf("你猜的日期早了，lucky day还没到呢\n");
                    printf("\n");
                    printf("再猜猜（1~31）:");
                }
                else
                    printf("你猜的日期早了，lucky day还没到呢\n");
            }
            else if (n > x) {
                printf("\n");
                if (a <= 2)
                {
                    printf("你猜的日期晚了，lucky day悄悄溜到前面啦\n");
                    printf("\n");
                    printf("再猜猜（1~31）:");
                }
                else
                    printf("你猜的日期晚了，lucky day悄悄溜到前面啦\n");
            }
            if (a == 3) {
                printf("\n");
                printf("\n");
                printf("次数用完啦。偷偷告诉你；12月，你的lucky day是%d号\n", x);
                printf("--------------------------------------------------");
                break;
            }      
            }
    return 0;
}

 

#include<stdio.h>
int main() {
    int a = 1, n;
    printf("input:");
    scanf("%d", &n);
    for (a = 1; a <= n; a++) {
        printf(" 0\n");
        printf("<H>\n");
        printf("I I\n");
        printf("\n");
    }
    return 0;
}

 

#include<stdio.h>
int main() {
    int a=1,b,c, n;
    printf("input:");
    scanf("%d", &n);
    for (a = 1; a <= n; a++) 
        printf(" 0\t");
    printf("\n");
    for (a = 1; a <= n; a++)
        printf("<H>\t");
    printf("\n");
    for (a = 1; a <= n; a++)
        printf("I I\t");
    return 0;
}

#include<stdio.h>
int main() {
    int n, a = 1,b=1,c=0,d=1,e=1;
    printf("input:");
    scanf("%d", &n);
    for (d=1;d<=n;d++)
    {
        b = 1 + 2*c;
        for (a = 1; a <= 2 * n - b; a++)
        {
             printf(" 0\t");  
        }
            printf("\n");
            for (a = 1; a <= 2 * n - b; a++)
            {
                printf("<H>\t");
            }
        printf("\n");
        for (a = 1; a <= 2 * n - b; a++)
        {
            printf("I I\t");
        }
        c++;
        printf("\n");
        printf("\n");
    }
    return 0;
}