Help with program using arrays.

The problem deals with writing a program to geta series of integers from a user and storing those values into an array. Then use a function called selection_sort, when given an array with n elements, the function must sort the array from smallet to largest values.

I have code, and im trying to get it to compile but im getting these implicit declaration errors and conflicting types, I have no idea why im getting them. Any help is appreciated, Here is my code and the compiler errors.

Code:

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Compilation started at Sun Feb 10 20:14:48

gcc -Wall -o ex9-1 ex9-1.c
ex9-1.c: In function ‘main’:
ex9-1.c:16:5: warning: implicit declaration of function ‘selection_sort’ [-Wimplicit-function-declaration]
ex9-1.c:20:2: warning: implicit declaration of function ‘prinf’ [-Wimplicit-function-declaration]
ex9-1.c: At top level:
ex9-1.c:31:6: warning: conflicting types for ‘selection_sort’ [enabled by default]
ex9-1.c:16:5: note: previous implicit declaration of ‘selection_sort’ was here
/tmp/ccKgLSrk.o: In function `main':
ex9-1.c:(.text+0xe2): undefined reference to `prinf'
collect2: ld returned 1 exit status

Compilation exited abnormally with code 1 at Sun Feb 10 20:14:49

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Code:

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#include <stdio.h>


int main(void) {

    int a[100], i, j, N;

    printf("How many numbers will you be entering: ");
    scanf("%d", &N);

    printf("Enter numbers to be sorted: ");
    for(i = 0; i < N; i++) {
    scanf("%d", &a[i]);
    }
   
    selection_sort(a[i], N);
   
    printf("Your sorted list of integers is : ");
    for(j = 0; j < N; j++) {
    prinf("%4d\n", &a[i]);
    }

    return 0;

}

void selection_sort(int a[], int size) {
    int i, j, x;

    for(i = 1; i <= size - 1; i++) {

    j = i;
    x = a[i];
   
    while(a[j - 1] > x && j > 0) {
        a[j] = a[j-1];
        j = j - 1;
    }
   
    a[j] = x;
    }
}

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You need a prototype for your selection sort function above main.
You need the 't' in printf on line 20, and you also want to drop the & unless you want to print out the addresses instead of the actual numbers.

Ok i fixed the printf, put the signature of the function before the main, and took out the & sign, it compiles, but it gives me this error in output.

Code:

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connor@connor-VirtualBox:~$ cd hw06
connor@connor-VirtualBox:~/hw06$ ./ex9-1
How many numbers will you be entering: 3
Enter numbers to be sorted: 1 2 3
Segmentation fault (core dumped)
connor@connor-VirtualBox:~/hw06$ ./ex9-1
How many numbers will you be entering: 3
Enter numbers to be sorted: 1
2
3
Segmentation fault (core dumped)
connor@connor-VirtualBox:~/hw06$

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You are passing in one instance of the array for your selection sort in main, you need to call it like this-> selection_sort(a,N);

EDIT: also in your final call to print your array you need to index the array with the variable j, not i.

Code:

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printf("Your sorted list of integers is : ");
    for(j = 0; j < N; j++) {
    printf("%4d\n", a[i]);//<-You are using i here, but the loop is using the variable j
    }

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ok that works, How would i set this up so that i can have the user enter as many numbers as they want, until they hit a certain button on the keyboard, like ctrl + d?