Nộp bài Bùi Đại Dương

main.c

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#include <stdio.h>

int q1() {
    float a, b;
    scanf("%f", &a);
    scanf("%f", &b);
    
    if (a > b) {
        printf("float a>b");
    } else {
        printf("float a<=b");    
    }
    return 0;
}

int q2() {
    int a = 6, b = 2;
    
    printf("a + b = %d\n", a + b);
    printf("a - b = %d\n", a - b);
    printf("a * b = %d\n", a * b);
    printf("a / b = %f", (float) a / b);
    return 0;
}

int q3() {
    float square;
    scanf("%f", &square);
    printf("%.2f", square * 4);
    return 0;
}

int q4() {
    int n;
    scanf("%d", &n);
    int copyN = n;
    int reverseN = 0;
    if (n < 0) {
        printf("%d is not a palindrome number", n);
    } else {
        while (copyN > 0) {
            reverseN = reverseN * 10 + copyN % 10;
            copyN = copyN / 10;
        }
        reverseN += copyN;
        
        if (reverseN == n) {
            printf("%d is a palindrome number", n);
        } else {
            printf("%d is not a palindrome number", n);
        }
    }
}

int main()
{
    int bai;
    printf("Nhập bài số: ");
    scanf("%d", &bai);
    switch (bai) {
        case 1:
        return q1();
        
        case 2:
        return q2();
        
        case 3:
        return q3();
        
        case 4:
        return q4();
    }
    return 0;    
}