C语言11月30日上机代码

1.水仙花数

#include<stdio.h>
int main() {
    int i, a, b, c;
    for (i = 100; i <= 999; i++) {
        a = i % 10;
        b = i / 10 % 10;
        c = i / 100 % 10;
        if (i == a * a * a + b * b * b + c * c * c) {
            printf("%d ", i);
        }
    }
    return 0;
}

2.判断素数

#include<stdio.h>
int main() {
    int i, num;
    printf("please input the number :");
    scanf("%d", &num);
    for (i = 2; i < num; i++) {
        if (num % i == 0) {
            printf("%d 不是素数\n", num);
            return 0;
        }
    }
    printf("%d 不是素数\n", num);
    return 0;
}

3.判断完数

#include<stdio.h>
int main() {
    int i, num, sum;
    printf("please input the number :");
    scanf("%d", &num);
    sum = 0;
    for (i = 1; i < num; i++) {
        if (num % i == 0)
            sum = sum + i;
    }
    if (num == sum) {
        printf("%d 是完数\n", num);
    } else {
        printf("%d 不是完数\n", num);
    }
    return 0;
}

4.冒泡、选择排序（已发文章）

相关链接：冒泡选择

5.字符串长度

#include<stdio.h>
int main() {
    char s1[100];
    int i;
    printf("Please input s1:");
    gets(s1);
    for (i = 0; s1[i] != '\0'; i++);
    printf("The length of s1 is %d\n", i);
    return 0;
}

6.字符串连接

#include<stdio.h>
int main() {
    char s1[100], s2[30];
    int i, j;
    printf("Please input s1:");
    gets(s1);
    printf("Please input s2:");
    gets(s2);
    for (i = 0; s1[i] != '\0'; i++);
    for (j = 0; s2[j] != '\0'; j++, i++) {
        s1[i] = s2[j];
    }
    s1[i] = '\0';
    printf("Output\ns1:");
    puts(s1);
    printf("s2:");
    puts(s2);
    return 0;
}