Basic
Switch Case
Goto
Operators
if Statement
Nested if
While Loop
For Loop
Patterns
Array
2D Array
String Function Example
Pointers
Recursion Function
Structure
Excersises
Others
Basic
Switch Case
Goto
Operators
if Statement
Nested if
While Loop
For Loop
Patterns
Array
2D Array
String Function Example
Pointers
Recursion Function
Structure
Excersises
Others



C Program to Reverse Every Word of the Given String


Write a C program that reverses each word in a given string.

  • Reads a sentence character by character and stores it in a string until a newline is encountered.
  • Traverses the string to find the start and end indices of each word (non-space sequences).
  • Reverses the characters within each word using a two-pointer swapping technique.
  • Displays the modified string where all words are reversed, but word order remains unchanged.
Example : pgm.c 
#include <stdio.h>

int main() {
    char str[200];
    int i = 0;

    printf("Enter a sentence: ");
    while ((str[i] = getchar()) != '\n') {
        i++;
    }
    str[i] = '\0';

    int start = 0, end, temp;
    i = 0;

    while (str[i] != '\0') {
        // Find start of word
        if (str[i] != ' ') {
            start = i;
            // Find end of word
            while (str[i] != ' ' && str[i] != '\0') {
                i++;
            }
            end = i - 1;

            // Reverse the word between start and end
            while (start < end) {
                temp = str[start];
                str[start] = str[end];
                str[end] = temp;
                start++;
                end--;
            }
        } else {
            i++;
        }
    }

    printf("Reversed words: %s\n", str);

    return 0;
}

Output :

Enter a sentence: Hello World from C
Reversed words: olleH dlroW morf C