{"id":711,"date":"2024-10-19T13:40:10","date_gmt":"2024-10-19T08:10:10","guid":{"rendered":"https:\/\/codexplained.in\/?p=711"},"modified":"2025-11-24T15:36:04","modified_gmt":"2025-11-24T10:06:04","slug":"swap-two-numbers","status":"publish","type":"post","link":"https:\/\/codexplained.in\/?p=711","title":{"rendered":"Swap Two Numbers"},"content":{"rendered":"
\n#include <stdio.h>\n\nint main() \n{\n    \/\/ Declare variables to store the two numbers\n    int num1, num2, temp;\n\n    \/\/ Ask the user for input\n    printf("Enter the first number: ");\n    scanf("%d", &num1);\n\n    printf("Enter the second number: ");\n    scanf("%d", &num2);\n\n    \/\/ Display numbers before swapping\n    printf("Before swapping: num1 = %d, num2 = %d\\n", num1, num2);\n\n    \/\/ Swap the numbers\n    temp = num1;  \/\/ Store num1 in a temporary variable\n    num1 = num2;  \/\/ Assign the value of num2 to num1\n    num2 = temp;  \/\/ Assign the value of temp (original num1) to num2\n\n    \/\/ Display numbers after swapping\n    printf("After swapping: num1 = %d, num2 = %d\\n", num1, num2);\n\n    return 0;\n}\n\n<\/pre><\/div>\n\n\n
Explanation<\/h2>\n\n\n\n
return 0;<\/code>: This indicates that the program finished successfully and is returning an exit status of 0<\/code>.<\/p>\n\n\n\n
#include <stdio.h><\/code><\/strong>:<\/p>\n\n\n\n
This line includes the standard input-output library, allowing us to use functions for input and output, like printf<\/code> and scanf<\/code>.<\/p>\n\n\n\n
int main()<\/code><\/strong>:<\/p>\n\n\n\n
This defines the main function, where the program starts executing. The int<\/code> indicates that this function will return an integer value.<\/p>\n\n\n\n
Variable Declaration<\/strong>:<\/p>\n\n\n\n
int num1, num2, temp;<\/code>: Here, we declare three integer variables: num1<\/code> and num2<\/code> for storing the user inputs, and temp<\/code> for temporarily holding one of the values during the swap.<\/p>\n\n\n\n
Input from the User<\/strong>:<\/p>\n\n\n\n
printf(\"Enter the first number: \");<\/code>: This prompts the user to enter the first number.<\/p>\n\n\n\n
scanf(\"%d\", &num1);<\/code>: This reads the integer input and stores it in num1<\/code>.<\/p>\n\n\n\n
The same two lines are repeated for the second number, storing it in num2<\/code>.<\/p>\n\n\n\n
Displaying Values Before Swapping<\/strong>:<\/p>\n\n\n\n
printf(\"Before swapping: num1 = %d, num2 = %d\\n\", num1, num2);<\/code>: This line prints the values of num1<\/code> and num2<\/code> before they are swapped.<\/p>\n\n\n\n
Swapping the Numbers<\/strong>:<\/p>\n\n\n\n
temp = num1;<\/code>: The value of num1<\/code> is stored in the temporary variable temp<\/code>.<\/p>\n\n\n\n
num1 = num2;<\/code>: The value of num2<\/code> is assigned to num1<\/code>.<\/p>\n\n\n\n
num2 = temp;<\/code>: The original value of num1<\/code> (stored in temp<\/code>) is assigned to num2<\/code>.<\/p>\n\n\n\n
Displaying Values After Swapping<\/strong>:<\/p>\n\n\n\n
printf(\"After swapping: num1 = %d, num2 = %d\\n\", num1, num2);<\/code>: This prints the new values of num1<\/code> and num2<\/code> after swapping.<\/p>\n\n\n\n
Return Statement<\/strong>:<\/p>\n\n\n\n
return 0;<\/code>: This indicates that the program finished successfully and is returning an exit status of 0<\/code>.<\/p>\n\n\n\n
OUTPUT<\/h2>\n\n\n\n
Enter two numbers:
5 10
Before swapping: a = 5, b = 10
After swapping: a = 10, b = 5<\/p>\n