수업 문제풀이

//1405

#include<stdio.h>
#include<stdlib.h>
int main() {
    int num[1000];
    int num1,num2,i,j=0,temp=0;
    scanf_s("%d", &num1); //5
    
    for (i = 0; i < num1; i++) {
        scanf_s("%d", &num2);
        num[i] = num2;
    }
    
    for (i = 0; i < num1; i++) {
        printf("%d ", num[0]);
        temp = num[0]; //0
        for (j = 1; j < num1; j++) {
            num[j-1] = num[j];
            printf("%d ", num[j]);
        }
        num[num1-1] = temp; //4
        printf("\n");
    }
 
    system("pause");
    return 0;
}

//1409

#include<stdio.h>
#include<stdlib.h>
int main() {
    int arr[10];
    int num,num1,i;
    for (i = 0; i < 10; i++) {
        scanf_s("%d", &num);
        arr[i] = num;
    }
    scanf_s("%d", &num1);
    printf("%d", arr[num1 - 1]);
 
    system("pause");
    return 0;
}

//1566

#include <stdio.h>
#include<stdlib.h>
int a, n;
 
long long int pow(int a, int n);
 
int main()
{
    scanf_s("%d%d", &a, &n);
    printf("%lld\n", pow(a,n));
    system("pause");
}
long long int pow(int a, int n) {
    long long int expo = 1,i;
    for (i = 1; i <= n; i++) {
        expo *= a;
    }
    return expo;
}

//1580

#include<stdio.h>
#include<stdlib.h>
 
float circle(int banzi);
 
int main() {
    float banzi;
    scanf_s("%f", &banzi);
    printf("%.2f", circle(banzi));
    system("pause");
    return 0;
}
 
float circle(int banzi) {
    float banzi2=0;
    banzi2 = (float)banzi * banzi*3.14;
    return banzi2;
}