I've been coding a program to write data into a textfile and practice data processes in c, and find data from there, every data is stored as lines.There are lines, and data is stored line by line, such as:

student name student surname student phone etc.

When i take an input of "student name" it starts to print without printing the name itself, prints what comes after it, same happens if i search for surname, only phone will be printed out.

How can i solve this?

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(){
    FILE *filePtr;
    filePtr=fopen("std.txt","r");
    char char_input[50];
    char string[500];


    printf("%s","Please give an input of the phone number\n");
        scanf("%s",char_input);

        while(!feof(filePtr)){
            fscanf(filePtr,"%s",string);
                if(strcmp(string, char_input)== 0){
                    fgets(string,500,filePtr);
                    puts(string);
            }
        }
    fclose(filePtr);
}

Text file:

Andrew Brooks 865 965 55

Input:

Andrew

Output:

Brooks 865 965 55

Desired output:

Andrew Brooks 865 965 55

CodePudding user response：

Instead of incorrectly using feof() and fscanf(filePtr,"%s", ... to incorrectly read a line. Use fgets() to read a line of the file and convert to a string.

• Test the return value of fgets() to see if input occurred.

• Use strstr() to look for a matching sub-string within string.

Example:

    while (fgets(string, sizeof string, filePtr)) {
      if (strstr(string, char_input)){
        fputs(string, stdout);
      }
    }