Array prints an unwanted number for no reason-CodePudding

/*This is a c program that inputs an array of 9 numbers, reverses it and prints it*/

#include <stdio.h>

int main()
{
    int a[9]; 
    
    printf("Enter 9 numbers \n");
    
    int i;
    
    for(i=0;i<9;i  )
    {
        scanf("%d",&a[i]);
    }
    
    int n=10; 
    
    int t;
    
    for(i=0;i<9/2;i  )
    {
        t=a[i];
        a[i]=a[8-i];
        a[8-i]=t;
    }
    
    for(i=0;i<10;i  )
    {
        printf("%d\t",a[i]);
    }
    
}

This is the output:

Enter 9 numbers 1 2 3 4 5 6 7 8

9

9 8 7 6 5 4 3 2 1
32765

I want to understand where the 32765 is coming from and how to fix it.

CodePudding user response：

The last weird number you see there is the value of the next (10st) address from the cell after your array. "a" has been declared with 9 values, and you should remember that arrays in C start from 0. While printing you are trying to access 10 numbers (from 0 to 9)

CodePudding user response：

As other answers point out, you are using a wrong array length at the last loop.

To avoid these kind of mistakes, use macros or const variables to store the fixed length of the array. For example:

#define ARRAYLEN 9
// ...
int a[ARRAYLEN];
// ...
for (int i = 0; i < ARRAYLEN; i  ) {
    // ...
}