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Introduction
C "Hello, World!" ProgramPrint an Integer (Entered by the User)Add Two IntegersMultiply Two Floating-Point NumbersFind ASCII Value of a CharacterCompute Quotient and RemainderFind the Size of int, float, double and charSwap Two Numbers
Decision Making and Loops
Check Whether a Number is Even or OddCheck Whether a Character is a Vowel or ConsonantFind the Largest Number Among Three NumbersFind the Roots of a Quadratic EquationCheck Leap YearCheck Whether a Number is Positive or NegativeCheck Whether a Character is an Alphabet or notCalculate the Sum of Natural NumbersFind Factorial of a NumberGenerate Multiplication TableDisplay Fibonacci SequenceFind GCD of two NumbersFind LCM of two NumbersDisplay Characters from A to Z Using LoopCount Number of Digits in an IntegerReverse a NumberCalculate the Power of a NumberCheck Whether a Number is Palindrome or NotCheck Whether a Number is Prime or NotDisplay Prime Numbers Between Two IntervalsCheck Armstrong NumberDisplay Armstrong Number Between Two IntervalsDisplay Factors of a NumberMake a Simple Calculator Using switch...casePrint Pyramids and Patterns
Functions
Demonstrate the Working of Keyword longDisplay Prime Numbers Between Intervals Using FunctionCheck Prime or Armstrong Number Using User-defined FunctionCheck Whether a Number can be Expressed as Sum of Two Prime NumbersFind the Sum of Natural Numbers using RecursionFind Factorial of a Number Using RecursionFind G.C.D Using RecursionConvert Binary Number to Decimal and vice-versaConvert Octal Number to Decimal and vice-versaConvert Binary Number to Octal and vice-versaReverse a Sentence Using Recursioncalculate the power using recursion
Arrays and Pointers
Calculate Average Using ArraysFind Largest Element in an ArrayCalculate Standard DeviationAdd Two Matrices Using Multi-dimensional ArraysMultiply Two Matrices Using Multi-dimensional ArraysFind Transpose of a MatrixMultiply two Matrices by Passing Matrix to a FunctionAccess Array Elements Using PointerC Program Swap Numbers in Cyclic Order Using Call by ReferenceFind Largest Number Using Dynamic Memory Allocation
Strings
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Structures and Unions
Store Information of a Student Using StructureAdd Two Distances (in inch-feet system) using StructuresAdd Two Complex Numbers by Passing Structure to a FunctionCalculate Difference Between Two Time PeriodsStore Information of Students Using StructureStore Data in Structures Dynamically
File I/O
Write a Sentence to a FileRead the First Line From a FileDisplay its own Source Code as Output

C Program to Multiply Two Floating-Point Numbers

To understand this example, you should have the knowledge of the following C programming topics:

Program to Multiply Two Numbers


              

#include <stdio.h>
int main() {
    double a, b, product;
    printf("Enter two numbers: ");
    scanf("%lf %lf", &a, &b);

    // Calculating product
    product = a * b;

    // %.2lf displays number up to 2 decimal point
    printf("Product = %.2lf", product);

    return 0;
}

Output


              

Enter two numbers: 2.4
1.12
Product = 2.69

In this program, the user is asked to enter two numbers which are stored in variables a and b respectively.


              

printf("Enter two numbers: ");
scanf("%lf %lf", &a, &b);

Then, the product of a and b is evaluated and the result is stored in product.


              

product = a * b;

Finally, product is displayed on the screen using printf().


              

printf("Product = %.2lf", product);

Notice that, the result is rounded off to the second decimal place using %.2lf conversion character.