C program to remove spaces in a sentence using string concepts.

Problem

Remove all the spaces from an entered string at runtime with the help of while loop by checking spaces at each index of a character.

Solution

Consider an example given below −

It removes all the spaces from a given string. The given string is Tutorials Point C Programming. The result after removing spaces is TutorialsPointCProgramming.

An array of characters is called a string.

Given below is the declaration of a string −

char stringname [size];

For example, char string[50]; string of length 50 characters.

Initialization

• Using single character constant.

char string[10] = { ‘H’, ‘e’, ‘l’, ‘l’, ‘o’ ,‘\0’}

• Using string constants.

char string[10] = “Hello”:;

Accessing

There is a control string “%s” used for accessing the string till it encounters ‘\0’.

The logic we used to remove the spaces between strings is as follows −

while(string[i]!='\0'){
   check=0;
   if(string[i]==' '){
      j=i;
      while(string[j-1]!='\0'){
         string[j] = string[j+1];
         j++;
      }
      check = 1;
   }
   if(check==0)
   i++;
}

Example

Following is the C program to remove all the spaces in a sentence by using the string concepts −

#include<stdio.h>
int main() {
   char string[50];
   int i=0, j, check;
   printf("Enter any statement: ");
   gets(string);
   while(string[i]!='\0') {
      check=0;
      if(string[i]==' ') {
         j=i;
         while(string[j-1]!='\0') {
            string[j] = string[j+1];
            j++;
         }
         check = 1;
      }
      if(check==0)
      i++;
   }
   printf("\nSentence without spaces: %s", string);
   getch();
   return 0;
}

Output

When the above program is executed, it produces the following output −

Run 1:
Enter any statement: Tutorials Point C Programming
Sentence without spaces: TutorialsPointCProgramming
Run 2:
Enter any statement: Welcome to the world of tutorials
Sentence without spaces: Welcometotheworldoftutorials