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#ifndef FUNCTION05_HEADER
#define FUNCTION05_HEADER
 
#include <stdio.h>
 
void selection_sort(int array[], int size);
 
int main() {
    int array[100000], size;
    scanf("%d", &size);
    for (int i = 0; i < size; i++) {
        scanf("%d", &array[i]);
    }
    selection_sort(array, size);
    for (int i = 0; i < size; i++) {
        printf("%d%c", array[i], " \n"[i+1==size]);
    }
    return 0;
}
 
#endif  // FUNCTION05_HEADER

prog.cpp: In function ‘int main()’:
prog.cpp:10:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &size);
     ~~~~~^~~~~~~~~~~~~
prog.cpp:12:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &array[i]);
         ~~~~~^~~~~~~~~~~~~~~~~
/usr/bin/ld: /home/Z4tIAR/ccm9vQBI.o: in function `main':
prog.cpp:(.text.startup+0x70): undefined reference to `selection_sort(int*, int)'
collect2: error: ld returned 1 exit status

Standard output is empty