C Program to Find Frequency and Position of Characters in a String

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This is a C program to check whether a given character is present in a string, find frequency & position of occurrence.

Problem Description

This C Program checks whether a given character is present in a string, find frequency & position of occurrence.

Problem Solution

This C Program checks whether a given character is present in a string, it also displays it occurrence and frequency as shown in the program below.

Program/Source Code

Here is a source code of the C program to check if a given character is present in a string. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

/* 
 * C Program to Check whether a given Character is present in a
 * String, Find Frequency & Position of Occurrence 
 */
#include <stdio.h>
#include <string.h>
 
int main()
{
    char a, word[50];
    int i, freq = 0, flag = 0;
 
    printf("Enter character: ");
    scanf("%c", &a);
    printf("Now enter the word: ");
    scanf("%s", word);
    printf("Positions of '%c' in %s are: ", a, word);
    for (i = 0; i < strlen(word); i++)
    {
        if (word[i] == a)
        {
            flag = 1;
            printf("%d  ", i + 1);
            freq++;
        }
    }
    if (flag)
    {
        printf("\nCharacter '%c' occured for %d times.\n", a, freq);
    }
    else
    {
        printf("None\n");
    }
 
    return 0;
}
Program Explanation

In this C program, we are reading the character and the word to check the position of occurrence using ‘a’ and ‘word’ variables respectively. In for loop initialize the value of ‘i’ variable as 0. Check the length of the string is greater than the value of ‘i’ variable.

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Nested if else condition statement is used to check whether a given character is present in a string using the word[] variable is equal to the value of ‘a’ variable. If the condition is true then execute the statement. Initialize the value of ‘flag’ variable as 1 and increment the value of ‘freq’ variable. Print the characters, frequency & position of occurrence in a string.

Runtime Test Cases
 
$ cc charfrequency.c
$ ./a.out
Enter character: r
Now enter the word: programming
Positions of 'r' in programming are: 2  5  
Character 'r' occured for 2 times.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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