C Program to Implement Qsort using Function Pointers

This C Program implements qsort using function pointers.

Here is source code of the C Program implements qsort using function pointers. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/* 
```

 * C Program to Implement qsort using function pointers

```
 */
```
```
#include <stdio.h>
```
```
#include <stdio.h>
```
```
#include <stdlib.h>
```
```
#include <string.h>
```
```
 
```
```
struct s
```
```
{
```
```
    char empname[5];
```
```
    int empid;
```
```
};
```
```
 
```
```
/* To sort array elemets */
```

int int_call(const void *a1,const void *b1)

```
{
```
```
    const int *a = (const int *)a1;
```
```
    const int *b = (const int *)b1;
```
```
 
```
```
    if (*a > *b)
```
```
        return 1;
```
```
    else
```
```
    {
```
```
        if (*a == *b) 
```
```
            return 0;
```
```
        else
```
```
            return -1;
```
```
    }
```
```
}
```
```
 
```
```
/* To sort structure elemets */
```

int string_call(const void *a1, const void *b1)

```
{
```
```
    const char *a = (const char *)a1;
```
```
    const char *b = (const char *)b1;
```
```
    return(strcmp(a, b));
```
```
}
```
```
 
```
```
void main()
```
```
{
```
```
    int array1[5]={20, 30, 50, 60, 10};
```
```
    struct s emprec[5];
```
```
    int i, j;
```
```
 
```
```
    strcpy(emprec[0].empname, "bbb");
```
```
    emprec[0].empid = 100;
```
```
    strcpy(emprec[1].empname, "ccc");
```
```
    emprec[1].empid = 200;
```
```
    strcpy(emprec[2].empname, "eee");
```
```
    emprec[2].empid = 300;
```
```
    strcpy(emprec[3].empname, "aaa");
```
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    emprec[3].empid = 400;
```
```
    strcpy(emprec[4].empname,"ddd");
```
```
    emprec[4].empid = 500;
```

    qsort(array1, 5, sizeof(int), int_call);

    qsort(emprec, 5, sizeof(struct s), string_call);

```
    for (i = 0; i < 5; i++)
```
```
        printf("%d\t", array1[i]);
```

    printf("\nSorting of Structure elements ");

```
    for (i = 0; i < 5; i++)
```

        printf("\n%s\t%d", emprec[i].empname, emprec[i].empid);

```
    printf("\n");
```
```
}
```

$ cc qsort_fp.c
$ a.out
10    20    30    50    60    
Sorting of Structure elements 
aaa    400
bbb    100
ccc    200
ddd    500
eee    300

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