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C-Programs-on-integers

1. Write C program to copy contents of one file to anor file. 

include  
#include  // For exit() 
void main() 
{ 
    FILE *fptr1, *fptr2; 
    char filename[100], c; 
    printf("Enter the filename to open for reading \n"); 
    scanf("%s", filename); 
    // Open one file for reading 
    fptr1 = fopen(filename, "r"); 
    if (fptr1 == NULL) 
    { 
        printf("Cannot open file %s \n", filename); 
        exit(0); 
    } 
    printf("Enter the filename to open for writing \n"); 
    scanf("%s", filename); 
    // Open another file for writing 
    fptr2 = fopen(filename, "w"); 
    if (fptr2 == NULL) 
    { 
        printf("Cannot open file %s \n", filename); 
        exit(0); 
    } 
    // Read contents from file 
    c = fgetc(fptr1); 
    while (c != EOF) 
    { 
        fputc(c, fptr2); 
        c = fgetc(fptr1); 
    } 
    printf("\nContents copied to %s", filename);
    fclose(fptr1); 
    fclose(fptr2); 
    }
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2. Write a C Program to merge contents of two files into a third file. 

#include  
#include  
void main() 
{ 
   // Open two files to be merged 
   FILE *fp1 = fopen("file1.txt", "r"); 
   FILE *fp2 = fopen("file2.txt", "r"); 
   // Open file to store the result 
   FILE *fp3 = fopen("file3.txt", "w"); 
   char c; 
   if (fp1 == NULL || fp2 == NULL || fp3 == NULL) 
   { 
         puts("Could not open files"); 
         exit(0); 
   } 
   // Copy contents of first file to file3.txt 
   while ((c = fgetc(fp1)) != EOF) 
    {
      fputc(c, fp3); 
     }
   // Copy contents of second file to file3.txt 
   while ((c = fgetc(fp2)) != EOF) 
    {
      fputc(c, fp3); 
    }
   printf("Merged file1.txt and file2.txt into file3.txt"); 
   fclose(fp1); 
   fclose(fp2); 
   fclose(fp3); 
}

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3. Write a C Program to print contents of file. 

#include  
#include  // For exit() 
void main() 
{ 
    FILE *fptr; 
    char filename[100], c; 
    printf("Enter the filename to open \n"); 
    scanf("%s", filename); 
    // Open file 
    fptr = fopen(filename, "r"); 
    if (fptr == NULL) 
    { 
        printf("Cannot open file \n"); 
        exit(0); 
    } 
    // Read contents from file 
    c = fgetc(fptr); 
    while (c != EOF) 
    { 
        printf ("%c", c); 
        c = fgetc(fptr); 
    } 
    fclose(fptr); 
}

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4. Write a C Program to count Number of Characters in a File 

#include  
#include  // For exit() 
#define MAX_FILE_NAME 100 
void  main() 
{ 
    FILE* fp; 
    int count = 0; 
    char filename[MAX_FILE_NAME]; 
    printf("Enter file name: "); 
    scanf("%s", filename); 
    // Open the file 
    fp = fopen(filename, "r"); 
    // Check if file exists 
    if (fp == NULL) { 
        printf("Could not open file %s", 
               filename); 
        exit(0); 
    } 
    // Extract characters from file 
    // and store in character c 
    for (c = getc(fp); c != EOF; c = getc(fp)) 
        {
        // Increment count for this character 
        count = count + 1; 
        }
    // Close the file 
    fclose(fp); 
    // Print the count of characters 
    printf("The file %s has %d characters\n ", 
           filename, count); 
}
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Topics

This Chapter C-Programs-on-integers consists of the following topics

IOE C Programming Solutions

datafiles in c

Write C program to copy contents of one file to anor file.

;

Write a C Program to merge contents of two files into a third file.

;

Write a C Program to print contents of file.

;

Write a C Program to count Number of Characters in a File

;