C program remove spaces or blanks from a string, For example consider the string

"c  programming"

There are two spaces in this string, so our program will print a string

“c programming”. It will remove spaces when they occur more than one time consecutively in string anywhere.

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C programming code

#include <stdio.h>
 
int main()
{
   char text[1000], blank[1000];
   int c = 0, d = 0;
 
   printf("Enter some text\n");
   gets(text);
 
   while (text[c] != '\0') {
      if (text[c] == ' ') {
         int temp = c + 1;
         if (text[temp] != '\0') {
            while (text[temp] == ' ' && text[temp] != '\0') {
               if (text[temp] == ' ') {
                  c++;
               }  
               temp++;
            }
         }
      }
      blank[d] = text[c];
      c++;
      d++;
   }
 
   blank[d] = '\0';
 
   printf("Text after removing blanks\n%s\n", blank);
 
   return 0;
}

If you want you can copy blank into text string so that original string is modified.

Output of program:

C program remove spaces or blanks from a string

C programming code using pointers

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define SPACE ' '
 
char *process(char*);
 
int main()
{
   char text[1000], *r;
 
   printf("Enter a string\n");
   gets(text);
 
   r = process(text);
 
   printf("\"%s\"\n", r);
 
   free(r);     
 
   return 0;
}
 
char *process(char *text) {
   int length, c, d;
   char *start;
 
   c = d = 0;
 
   length = strlen(text);
 
   start = (char*)malloc(length+1);
 
   if (start == NULL)
      exit(EXIT_FAILURE);
 
   while (*(text+c) != '\0') {
      if (*(text+c) == ' ') {
         int temp = c + 1;
         if (*(text+temp) != '\0') {
            while (*(text+temp) == ' ' && *(text+temp) != '\0') {
               if (*(text+temp) == ' ') {
                  c++;
               }  
               temp++;
            }
         }
      }
      *(start+d) = *(text+c);
      c++;
      d++;
   }
   *(start+d)= '\0';
 
   return start;
}

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