C %d

#include <stdio.h>

int main() {
    int a = 5;
    int b = 10;
    int c;

    c = a + b;
    printf("The sum of a and b is: %d\n", c);

    return 0;
}

Explanation: - The program begins by including the standard input-output header file, <stdio.h>, which provides functions like printf and scanf. - Inside the main() function, three integer variables are declared: a, b, and c. - a is assigned the value 5, and b is assigned the value 10. - A third variable c is declared to store the sum of a and b. - The sum of a and b is calculated and stored in variable c using the assignment operator =. - The printf function is used to display the sum of a and b by printing "The sum of a and b is: %d\n" along with the value stored in variable c. - The \n in the format string represents a newline character, moving the output to the next line. - Finally, the return 0; statement indicates that the program execution was successful, and 0 is returned to the operating system.