File Number Control C Program Example

How to write a C Program to File Number Control in C Programming Language ?

Solution:

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
void main()
{
FILE *fp, *fc;
int lineNum; //stores line number which should be edited.
int lineCount = 0; //count number lines in source file.
int charCount = 0;
int ch; //temporary place to store character of source file(one at a time).
int edited = 0; //0=false and 1=true
int t; //temporary place to store input which you want to be replaced with error in text file.
int *line;
fp = fopen("source.txt", "r+");
if (fp == NULL)
{
printf("\nError...cannot open/create files");
}
line = (int*)malloc(sizeof(int)*(lineCount+1));
line[0] = 0;
fseek(fp, 0, SEEK_SET);
while (true)
{
ch = fgetc(fp);
charCount++;
if (ch == '\n') //counts number of lines
{
lineCount++;
line = (int*)realloc(line, sizeof(int)*(lineCount + 1));
line[lineCount] = charCount+1;
}
if (ch == EOF)
{
lineCount++;
line = (int*)realloc(line, sizeof(int)*(lineCount + 1));
line[lineCount] = charCount+1;
break;
}
}
for (int i = 0; i <= lineCount; i++)
{
printf("line[%d] byte offset is %d\n", i, line[i]);
}
if (fseek(fp, 7, SEEK_SET) != 0)
printf("FSEEK ERROR!\n");
else
fprintf(fp, "YYY");
printf("Number of lines in file: %d", lineCount);
system("PAUSE");
}

Number

Control

File