0x0F. C Function pointers Task 2 - humtej1204/holbertonschool-low_level_programming GitHub Wiki

2. To hell with circumstances; I create opportunities

Write a function that searches for an integer.

  • Prototype: int int_index(int *array, int size, int (*cmp)(int));
  • where size is the number of elements in the array array
  • cmp is a pointer to the function to be used to compare values
  • int_index returns the index of the first element for which the cmp function does not return 0
  • If no element matches, return -1
  • If size <= 0, return -1 
julien@ubuntu:~/0x0e. Function pointers$ cat 2-main.c
#include <stdio.h>
#include "function_pointers.h"

/**
 * is_98 - check if a number is equal to 98
 * @elem: the integer to check
 *
 * Return: 0 if false, something else otherwise.
 */
int is_98(int elem)
{
    return (98 == elem);
}

/**
 * is_strictly_positive - check if a number is greater than 0
 * @elem: the integer to check
 *
 * Return: 0 if false, something else otherwise.
 */
int is_strictly_positive(int elem)
{
    return (elem > 0);
}


/**
 * abs_is_98 - check if the absolute value of a number is 98
 * @elem: the integer to check
 *
 * Return: 0 if false, something else otherwise.
 */
int abs_is_98(int elem)
{
    return (elem == 98 || -elem == 98);
}

/**
 * main - check the code
 *
 * Return: Always 0.
 */
int main(void)
{
    int array[20] = {0, -98, 98, 402, 1024, 4096, -1024, -98, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 98};
    int index;

    index = int_index(array, 20, is_98);
    printf("%d\n", index);
    index = int_index(array, 20, abs_is_98);
    printf("%d\n", index);
    index = int_index(array, 20, is_strictly_positive);
    printf("%d\n", index);
    return (0);
}
julien@ubuntu:~/0x0e. Function pointers$ gcc -Wall -pedantic -Werror -Wextra -std=gnu89 2-main.c 2-int_index.c -o c
julien@ubuntu:~/0x0e. Function pointers$ ./c 
2
1
2
julien@ubuntu:~/0x0e. Function pointers$

Repo:

  • GitHub repository: holbertonschool-low_level_programming
  • Directory: 0x0F-function_pointers
  • File: 2-int_index.c
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