There are many ways to remove the trailing newline character from fgets input. Below I am mentioning some ways to remove the trailing newline character from the fgets input. You can use any one of them as per your requirement.
But here I want to mention that in the below solution some are the compliant solution and some are the non-compliant solutions.
Method 1:
#include <stdio.h>
#include <string.h>
#define BUFFER_SIZE 24
int main(void)
{
char buf[BUFFER_SIZE];
printf("Enter the data = ");
if (fgets(buf, sizeof(buf), stdin) == NULL)
{
printf("Fail to read the input stream");
}
else
{
buf[strlen(buf) - 1] = '\0';
}
printf("Entered Data = %s\n",buf);
return 0;
}
Explanation: The strlen() function computes the length of a string by determining the number of characters that precede the terminating null character. A problem occurs if the first character read from the input by fgets() happens to be a null character. This may occur, for example, if a binary data file is read by the fgets(). If the first character in buf is a null character, strlen(buf) returns 0, the expression strlen(buf) – 1 wraps around to a large positive value, and a write-outside-array-bounds error occurs.
Method 2:
#include <stdio.h>
#include <string.h>
#define BUFFER_SIZE 24
int main(void)
{
char buf[BUFFER_SIZE];
printf("Enter the data = ");
if (fgets(buf, sizeof(buf), stdin) == NULL)
{
printf("Fail to read the input stream");
}
else
{
//find new line
char *ptr = strchr(buf, '\n');
if (ptr)
{
//if new line found replace with null character
*ptr = '\0';
}
}
printf("Entered Data = %s\n",buf);
return 0;
}
Explanation: In the above C program strchr() (string function) replace the newline character in the string with ‘\0’ if it exists.
Method 3:
#include <stdio.h>
#include <string.h>
#define BUFFER_SIZE 24
int main(void)
{
char buf[BUFFER_SIZE];
printf("Enter the data = ");
if (fgets(buf, sizeof(buf), stdin) == NULL)
{
printf("Fail to read the input stream");
}
else
{
buf[strcspn(buf, "\n")] = '\0';
}
printf("Entered Data = %s\n",buf);
return 0;
}
Explanation: The strcspn() calculates the length of the number of characters before the 1st occurrence of character present in both the string. Because we have given “\n” as a second-string so we will get the length of the string before the “\n”. Now we put the ‘\0’ in place of ‘\n’.
Method 4:
#include <stdio.h>
#include <string.h>
#define BUFFER_SIZE 24
int main(void)
{
char buf[BUFFER_SIZE];
printf("Enter the data = ");
if (fgets(buf, sizeof(buf), stdin) == NULL)
{
printf("Fail to read the input stream");
}
else
{
strtok(buf,"\n");
}
printf("Entered Data = %s\n",buf);
return 0;
}
Note: strtok is not safe to use. You can use strtok_r in place of strtok.
Method 5:
#include <stdio.h>
#include <string.h>
#define BUFFER_SIZE 24
void removeNewLineChar(char *ptr)
{
while((ptr != NULL) && (*ptr != '\n'))
{
++ptr;
}
*ptr = '\0';
}
int main(void)
{
char buf[BUFFER_SIZE];
printf("Enter the data = ");
if (fgets(buf, sizeof(buf), stdin) == NULL)
{
printf("Fail to read the input stream");
}
else
{
removeNewLineChar(buf);
}
printf("Entered Data = %s\n",buf);
return 0;
}
Explanation: In this C program I am finding the position of ‘\n’ using the while loop and placing the null character ( ‘\0’). But you need to use this code very carefully.
Note: Some of the compliant solution and some Noncompliant solution. It is up to you which you want to use in your C program.
Recommended Articles for you:
- How to use fgets() in C?
- How to use fgetc() in C?
- Break Statements in C.
- Continue statement in C.
- File Handling in C, In Just A Few Hours!
- How to use fputs() in C?
- Format specifiers in C.
- How to create an employee record system.
- A brief description of the pointer in C.
- Dangling, Void, Null and Wild Pointers.
- How to use fread() in C?
- How to use fwrite() in C?
- Function pointer in c, a detailed guide
- How to use the structure of function pointer in c language?
- Function pointer in structure.
- How to use fopen() in C?
- How to create a library management system project in C
2 comments