The C language does not provide a standard function that removes trailing spaces from a string. It is easy, however, to build your own function to do just this. The following program uses a custom function named rtrim() to remove the trailing spaces from a string. It carries out this action by iterating through the string backward, starting at the character before the terminating null character ( ) and ending when it finds the first non space character. When the program finds a non space character, it sets the next character in the string to the terminating null character ( ), thereby effectively eliminating all the trailing blanks. Here is how this task is performed:
#include <stdio.h>
#include <string.h>
void main(void);
char* rtrim(char*);
void main(void){
char* trail_str = "This string has trailing spaces in it. "; /* Show the status of the string before calling the rtrim() function. */
printf("Before calling rtrim(), trail_str is '%s'n", trail_str);
printf("and has a length of %d.n", strlen(trail_str)); /* Call the rtrim() function to remove the trailing blanks. */
rtrim(trail_str); /* Show the status of the string after calling the rtrim() function. */
printf("After calling rtrim(), trail_str is '%s'n", trail_str); printf("and has a length of %d.n", strlen(trail_str));}/*
The rtrim() function removes trailing spaces from a string. */char*
rtrim(char* str){
int n = strlen(str) - 1; /* Start at the character BEFORE the null character ( ). */
while (n>0) /* Make sure we don't go out of bounds... */
{
if (*(str+n) != ' ') /* If we find a nonspace character: */
{ *(str+n+1) = ' '; /* Put the null character at one character past our current position. */
break; /* Break out of the loop. */
}
else /* Otherwise, keep moving backward in the string. */
n--;
}
return str; /* Return a pointer to the string. */
}
Notice that the rtrim() function works because in C, strings are terminated by the null character. With the insertion of a null character after the last nonspace character, the string is considered terminated at that point, and all characters beyond the null character are ignored. C
Topic: Strings
How can I remove the trailing spaces from a string?
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