c array

/*
#include<stdio.h>

int main()
{
    int arr[10];
    int n;
    int found = 0;
    int i;

    printf("Please enter 6 numbers:");
    for(i = 1; i <= 6; i ++){
        scanf("%d", &arr[i]);
    }
    printf("Enter a number:");
    scanf("%d", &n);

    for(i = 1; i <= 6; i ++)
        if(arr[i] == n){
            printf("position = %d\n", i);
            found = 1;
            break;
        }
    if(found == 0)
        printf("not found!\n");
    return 0;
}

#include<stdio.h>

int main()
{
    int arr[100];
    int n;
    int i, j;
    int tmp;

    printf("Enter the length of arr (n<100):");
    scanf("%d", &n);
    printf("Enter %d numbers:", n);
    for(i = 1; i <= n; i ++)
        scanf("%d", &arr[i]);

    for(i = 1; i <= n; i ++)
        printf("arr[%d] = %d ", i, arr[i]);
    printf("\n");
    
    i = 1;
    j = n;
    for(;i < j;){
        tmp = arr[i];
        arr[i] = arr[j];
        arr[j] = tmp;
        i ++;
        j --;
    }

    for(i = 1; i <= n; i ++)
        printf("arr[%d] = %d ", i, arr[i]);
    printf("\n");
    return 0;
}


#include<stdio.h>

int main()
{
    int arr[100];
    int n;
    int k[100] = {0};
    int x;
    int i, j;

    j = 0;
    printf("Enter the length of arr (n<100):");
    scanf("%d", &n);
    printf("Enter %d numbers (x<=100):", n);
    for(i = 1; i <= n; i ++){
        scanf("%d", &x);
        if(k[x] == 0){
            k[x] = 1;
            j ++;
            arr[j] = x;
        }
    }
    printf("Output:");
    for(i = 1; i <= j; i ++){
        printf("%d ", arr[i]);
    }
    return 0;
}



#include<stdio.h>

int main()
{
    float student[3][5];
    float sum, ave;

    for(int i = 0; i < 3; i ++){
        sum = 0, ave = 0;
        printf("Enter %d stundent's score (5 numbers):", i+1);
        for(int j = 0; j < 5; j ++){
            scanf("%f", &student[i][j]);
            sum = sum + student[i][j];
        }
        ave = sum / 5;
        printf("sum = %.2f", sum);
        printf(" ave = %.2f", ave);
        printf("\n");
    }
    return 0;
}

  


#include<stdio.h>

int main()
{
    char arr_a[100];
    char arr_b[100];

    printf("Input the value of array a:");
    scanf("%s", arr_a);
    printf("Input the value of array b:");
    scanf("%s", arr_b);

    printf("The result is:%s%s\n", arr_a, arr_b);
}


#include<stdio.h>

int main()
{
    char s[100];
    char c;
    int s_length = 0;
    int i, j;
    int k = 1;

    while((c = getchar()) != '!'){
        s_length ++;
        s[s_length] = c;
    }

    i = 1;
    j = s_length;
    for(;i < j;){
        if(s[i] != s[j]){
            k = 0;
            break;
        }
        i ++;
        j --;
    }
    if(k == 1)
        printf("yes!\n");
    else
        printf("no!\n");
}

#include<stdio.h>

int main()
{
    int input;
    int a;
    int m, s, r;
    int i;
    int output[100];
    char c;
    char output_char[100];
    
    c = 'A';
    for(i = 10; i <= 30; i ++){
        output_char[i] = c;
        c ++;
    }
    printf("输入一个十进制数:");
    scanf("%d", &input);
    printf("输入要转化的进制:(30进制以内)");
    scanf("%d", &a);
    m = input;
    i = 0;
    for(;s != 0;){
        s = m / a;
        r = m % a;
        i ++;
        output[i] = r;
        m = s;
    }
    printf("output:");
    for(;i >= 1; i --){
        if(output[i] <= 9)
            printf("%d", output[i]);
        else
            printf("%c", output_char[output[i]]);
    }
    return 0;
}

*/