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#include <stdio.h>
#include <stdlib.h>
 
int values[] = { 40, 10, 100, 90, 20, 25, 12, 13, 10, 40 };
 
int compare (const int *a, const int *b)
{
    return *a  - *b; 
}
 
int main ()
{
    int n;
    for (n=0; n<10; n++)
    {
        printf("%d ",values[n]);
    }
    printf("\n");
    qsort (values, 10, sizeof(int), compare);
    for (n=0; n<10; n++)
    {
        printf ("%d ",values[n]);
    }
    printf("\n");
    system("pause");
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:19: error: invalid conversion from ‘int (*)(const int*, const int*)’ to ‘int (*)(const void*, const void*)’
prog.cpp:19: error:   initializing argument 4 of ‘void qsort(void*, size_t, size_t, int (*)(const void*, const void*))’
prog.cpp:25: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result

Standard output is empty