实验3

1

#include <stdio.h>

char score_to_grade(int score);  // 函数声明

int main() {
    int score;
    char grade;

    while(scanf("%d", &score) != EOF) {
        grade = score_to_grade(score);  // 函数调用
        printf("分数: %d, 等级: %c\n\n", score, grade);
    }

    return 0;
}

// 函数定义
char score_to_grade(int score) {
    char ans;

    switch(score/10) {
    case 10:
    case 9:   ans = 'A'; break;
    case 8:   ans = 'B'; break;
    case 7:   ans = 'C'; break;
    case 6:   ans = 'D'; break;
    default:  ans = 'E';
    }

    return ans;
}

 

2

#include <stdio.h>

int sum_digits(int n);

int main(){
    int n;
    int ans;

    while(printf("Enter n: "), scanf("%d", &n) != EOF){
        ans = sum_digits(n);
        printf("n = %d, ans = %d\n\n", n, ans);
    }

    return 0;
}

int sum_digits(int n){
    int ans = 0;

    while(n != 0){
        ans += n % 10;
        n /= 10;
    }

    return ans;
}

 

3

#include <stdio.h>

int power(int x, int n);

int main(){
    int x, n;
    int ans;

    while(printf("Enter x and n:"),scanf("%d%d", &x, &n) != EOF){
        ans = power(x, n);
        printf("n = %d, ans = %d\n\n", n, ans);
    }

    return 0;
}

int power(int x, int n){
    int t;

    if(n == 0)
        return 1;
    else if(n % 2)
        return x * power(x, n-1);
    else{
        t = power(x, n/2);
        return t*t;
    }
}

 

4

#include <stdio.h>

int classify_triangle(int a, int b, int c);

int main(){
    int a, b, c, x;

    while(scanf("%d%d%d", &a, &b, &c) != EOF){
        x = classify_triangle(a, b, c);
        switch(x){
        case 0:
            printf("不能构成三角形\n\n");
            break;
        case 1:
            printf("普通三角形\n\n");
            break;
        case 2:
            printf("等边三角形\n\n");
            break;
        case 3:
            printf("等腰三角形\n\n");
            break;
        case 4:
            printf("直角三角形\n\n");
            break;
        }
    }

        return 0;
    }

int classify_triangle(int a, int b, int c){
    if(a >= b + c || b >= a + c || c >= a + b)
        return 0;

    if(a == b && b == c)
        return 2;

    if(a == b || a == c || c == b)
        return 3;

    if(a*a == b*b + c*c || b*b == a*a +c*c || c*c == a*a + b*b)
        return 4;

    else
        return 1;
}

 

5

#include<stdio.h>
int func(int n, int m);

int main(){
    int n, m;
    int ans;

    while(scanf("%d%d", &n, &m) != EOF){
        ans = func(n, m);
        printf("n = %d, m = %d, ans = %d\n\n", n, m, ans);
    }

    return 0;
}

int func(int n, int m){
    long long a = 1;
    int i;

    if(m > n)
        return 0;

    if(m == n || m == 0)
        return 1;

    if(m > n - m)
        m = n - m;

    if(m < n){
        for(i = 1; i <= m; i++){
            a = a*(n - m + i)/i;
        }
    }

    return a;
}

 

6

#include <stdio.h>

int gcd(int a, int b, int c);


int main(){
    int a, b, c;
    int ans;

    while(scanf("%d%d%d", &a, &b, &c) != EOF){
        ans = gcd(a, b, c);
        printf("最大公约数： %d\n\n", ans);
    }

    return 0;
}

int gcd(int a, int b, int c){
    int i = a;

    if(b < a){
        if(b <= c)
            i = b;
        if(c < b)
            i = c;
    }

    for(i; i >= 1; --i){
        if(a % i == 0 && b % i == 0 && c % i == 0)
        return i;

    }
    return i;
}

 

7

#include <stdio.h>
#include <stdlib.h>
void print_charman(int n);

int main(){
    int n;
    printf("Enter n:");
    scanf("%d", &n);
    print_charman(n);

    return 0;
}

void print_charman(int n){
    int count, i = 0, k, x;

    for(i; i <= n; i++){
        count = 2*(n - i) - 1;

    for(x = 0; x < i; ++x){
        printf("\t");
    }
    for(k = 0; k < count; k++ ){
        printf(" O\t");
    }
    printf("\n");

    for(x = 0; x < i; ++x){
        printf("\t");
    }
    for(k = 0; k < count; k++ ){
        printf("<H>\t");
    }
    printf("\n");

    for(x = 0; x < i; ++x){
        printf("\t");
    }
    for(k = 0; k < count; k++ ){
        printf("I I\t");
    }
    printf("\n");
    }
}