Programming for Problem Solving [ Lab Programs ]

Write a C program to merge two files into a third file (i.e., the contents of the first file followed by those of the second are put in the third file).

file1.txt

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file2.txt

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C Program

//to merge two files into a third file.
#include <stdio.h>
#include <ctype.h>   

int main() {
    FILE *file1, *file2, *file3;
    char ch;

    // Open first file
    file1 = fopen("file1.txt", "r");
    if (file1 == NULL) {
        printf("Error opening first file.\n");
        return 1;
    }

    // Open second file
    file2 = fopen("file2.txt", "r");
    if (file2 == NULL) {
        printf("Error opening second file.\n");
        fclose(file1);
        return 1;
    }

    // Open third file (output)
    file3 = fopen("file3.txt", "w");
    if (file3 == NULL) {
        printf("Error creating destination file.\n");
        fclose(file1);
        fclose(file2);
        return 1;
    }

    // Copy contents of first file
    while ((ch = fgetc(file1)) != EOF) {
        fputc(ch, file3);
    }

    // Copy contents of second file
    while ((ch = fgetc(file2)) != EOF) {
        fputc(ch, file3);
    }

    printf("Files merged successfully.");

    // Close all files
    fclose(file1);
    fclose(file2);
    fclose(file3);

    return 0;
}

OUTPUT

Files merged successfully.

file3.txt

Welcome to StudyGlance, A Fully loaded Notebook.

C Programming Practice Problems

Simple Numeric Problems

1. Write a program for finding the max and min from the three numbers. View Solution

2. Write the program for the simple, compound interest. View Solution

3. Write a program that prints a multiplication table for a given number and the number of rows in the table. View Solution

4. Write a program that shows the binary equivalent of a given positive number between 0 to 255. View Solution

Expression Evaluation

1. Write a C program, which takes two integer operands and one operator from the user, performs the operation and then prints the result. (Consider the operators +,-,*, /, % and use Switch Statement). View Solution

2. Write a program that finds if a given number is a prime number. View Solution

3. Write a C program to find the sum of individual digits of a positive integer and test given number is palindrome. View Solution

4. A Fibonacci sequence is defined as follows: the first and second terms in the sequence are 0 and 1. Subsequent terms are found by adding the preceding two terms in the sequence. Write a C program to generate the first n terms of the sequence. View Solution

Arrays, Pointers and Functions

1. Write a C program to find the minimum, maximum and average in an array of integers. View Solution

2. Write a C program that uses functions to perform Addition of two matrices. View Solution

3. Write a C program that uses functions to perform Multiplication of two matrices. View Solution

4. Write a program for reading elements using a pointer into an array and display the values using the array. View Solution

5. Write a program for display values reverse order from an array using a pointer. View Solution

Files

1. Write a C program which copies one file to another, replacing all lowercase characters with their uppercase equivalents. View Solution

2. Write a C program to merge two files into a third file (i.e., the contents of the first file followed by those of the second are put in the third file). View Solution

Strings

1. Write a C program that uses functions to insert a sub-string into a given main string from a given position View Solution

2. Write a C program that uses functions to delete n Characters from a given position in a given string View Solution

3. Write a C program to determine if the given string is a palindrome or not (Spelled same in both directions with or without a meaning like madam, civic, noon, abcba, etc.) View Solution

4. Write a C program that displays the position of a character ch in the string S or – 1 if S doesn’t contain ch. View Solution

5. Write a C program to count the lines, words and characters in a given text. View Solution

Sorting and Searching

1. Write a C program that uses non-recursive function to search for a Key value in a given list of integers using linear search method. View Solution

2. Write a C program that uses non-recursive function to search for a Key value in a given sorted list of integers using binary search method. View Solution

3. Write a C program that implements the Bubble sort method to sort a given list of integers in ascending order. View Solution

4. Write a C program that sorts the given array of integers using selection sort in descending orde. View Solution

5. Write a C program that sorts the given array of integers using insertion sort in ascending order. View Solution

6. Write a C program that sorts a given array of names. View Solution

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