C Tutorial

C Tutorial C Language Environment Setup Execution flow of C program C printf and Scanf C Data type C Token Variable in C Operators in C Comments in C Escape Sequence in C C – Storage Classes C Decision control statement Loop Statement in C Break, continue and goto statement in C Type Casting in C Function in C Recursion in C String in C C Array Pointer in C Dynamic memory allocation C –Structure Nested Structure in C Union in C File Handling in C C pre-processor Static Function In C Sizeof In C Selection Sort In C Scope Of Variables In C Runtime Vs Compile Time In C Random Access Lseek In C Queue Implementation In C Pseudo Code In C Prototype In C Pointer To Pointer In C Pointer Arithmetic In C Passing Array To Function In C Null Character In C Merge Sort In C Macros In C Library Functions In C Memory Leak In C Int In C Goto And Labels In C Fibonacci Series In C Fflush In C Derived Data Types In C Data Types In C Const Vs Volatile In C Character Set In C Character Class Tests In C Calloc In C C Pointers Arrays In C Include In C Clrscr In C C Vs Java String Literals In C Types Of Pointers In C Variables In C Volatile In C Why C Is A Middle Level Language Infix To Postfix Program In C Ceil function in C LCM of two numbers in C Quick sort in C Static in C function pointer as argument in C Top Array Keywords in C Add two numbers using the function in C Armstrong program in C using function Array, Declaring Arrays and Array Initialization Limitations of Inline Function in C Merge and Merge sort with example in C Do-While Loop in C For Loop in C While-Loop in C Difference between while and do-while loop in C Array Of Structures in C Data Structures And Algorithms in C Types Of Structures In C How to Avoid Structure Padding in C Use of Structure in C Do WHILE LOOP in C Programming Examples For Loop in C Programming Examples Entry Control Loop in C Exit control loop in C Infinite loop in C Nested loop in C pow() function in C String Handling functions in C Prime Number code in C Factorial Program in C using For Loop Factorial Program in C Using While Loop Fibonacci Series in C Using For Loop Fibonacci series in C using while loop Prime Number Program in C using for Loop While Loop in C programming examples Built-in functions in C Assert() Function C vs Java Strings Call Back Function in Embedded C Else If Ladder fgets() function Ftell() Function getc() function getch() function gets() function Heap Sort Nested if-else statement Pi() Function Positioning of file Write() function abs() function in C Attributes in C C program to find factorial of a number using Recursion Ferror() in c fopen() function in C Fibonacci series program in C using Recursion Formatted Input and output function in C Snake Game in C User Defined Functions in C Beep() function in C Cbrt() function in C Hook() function in C Isalnum() function in C C Program to find the Roots of a Quadratic Equation C Switch Statements Difference between rand() and srand() function in C Difference between while and for loop in C Doubly Linked list in C Example of Iteration in C How to use atoi() function in C How to use floor() function in C How to use sine() function in C How to use Typedef Struct in C Integer Promotions in C C Program to Find Largest Number Using Dynamic Memory Allocation C Program to Find the Largest Number using Ternary Operator C/C++ Program to Find the Size of int, float, double and char Find the Largest Three Distinct Elements in an Array using C/C++ Loop Questions in C Modulus on Negative Numbers in C Multiplication table program in C using For loop Nested Loops in C Programming Examples C Program for Mean and Median of an Unsorted Array Results of Comparison Operations in C and C++ Reverse a Stack using Recursion in C Simple hash() function in C strcat() Function in C Sum of N numbers in C using For loop Use of free() function in C Write a program that produces different results in C and C++

C Decision control statement

Decision Making

C conditional statements are used to specify one or more conditions. The statements will be executed if the condition becomes true otherwise alternative statement will be executed if the condition becomes false. C language supports the following statement:
     
  • If statement
  •  
  • Switch Statement
  •  
  • Conditional operator statement
  •  
  • goto statement
If statement
If statement is used to perform the operation according to condition. In other words, we can say that it controls the flow of execution of the statement. The condition may be true or false. There are various ways to use if statement:
     
  • If statement
  •  
  • If-else statement
  •  
  • Else if Ladder
If Statement
In C language, if statement is used to execute the code if the condition is true. The following syntax of if statement is:
Syntax:
if(expression/ condition)
{
//code to be executed
}
Example
#include <stdio.h>
int main()
{
int n=0;
printf("---- To Chcek The Number is Even or Odd ---- \n");
printf("Enter any number : ");
scanf("%d",&n);
if(n%2==0){
printf("Even Number");
}
return 0;
}
Output
---- To Chcek The Number is Even or Odd ----
Enter any number : Even Number

If- else statement:

If-else statement is used to execute the code if the condition is true or false. The given following

 

Syntax of if-else statement:

if(expression)
{
//code to be executed if condition is true
}else{
//code to be executed if condition is false
}
Example
#include <stdio.h>
int main()
{
int n=0;
printf("---- To Chcek The Number is Even or Odd ---- \n");
printf("Enter any number : ");
scanf("%d",&n);
if(n%2==0){
printf("Even Number");
}
else{
printf("Odd Number");
}
return 0;
}
Output
---- To Chcek The Number is Even or Odd ----
Enter any number : Even Number

If else-if ladder statement

It is used to execute one code from multiple conditions.

Syntax:

if(expression1)
{
statement block1;
}
else if(expression2)


{
statement block2;
}
else if(expression3 )
{
statement block3;
}
Else
default statement;

Switch Statement

The switch statement is used to execute the code from multiple condition or case. Following is the flow chart of the switch statement.

Syntax:

switch(expression)
{
case value-1:
block-1;
break;
case value-2:
block-2;
break;
case value-3:
block-3;
break;
case value-4:
block-4;
break;
default:
default-block;
break;
}

Rules for switch statement

The switch(expression) must be an integer or character type.

     
  • We can use only byte, short, int, char data type with a switch statement.
  •  
  • With switch statement not use float data type.
  •  
  • We can use any number of case statements within a switch.
  •  
  • The case value can be used only inside the switch statement.
  •  
  • Value for a case must be the same as the variable in a switch.
Let us consider an example
#include <stdio.h>
#include <stdlib.h>
int main()
{
int ch;
printf("Enter any Number: ");
scanf("%d",&ch);
switch(ch)
{
case 1:
printf("Today is Sunday");
break;
case 2:
printf("Today is Monday");
break;
case 3:
printf("Today is Tuesday");
break;
case 4:
printf("Today is Wednesday");
break;
case 5:
printf("Today is Thursday");
break;
case 6:
printf("Today is Friday");
break;
case 7:
printf("Today is saturday");
break;
default:
printf("Please Enter Value between 1 to 7");
return 0;
}
}
Output
Enter any Number: Please Enter Value between 1 to 7
Example
#include <stdio.h>
int main()
{
int day;
printf("Enter any Week day Number: ");
scanf("%d",&day);
if(day==1){
printf("1st day Sunday");
}
else if(day==2){
printf("2nd Day Monday");
}
else if(day==3){
printf("3rd Day Tuesday");
}
else if(day==4){
printf("4th Day Wednersday ");
}
else if(day==5){
printf("5th Day Thursday");
}
else if(day==6){
printf("6th Day Friday");
}
else if(day==7){
printf("7th Day Saurday");
}
else{
printf("Not a Day of Week");
}
return 0;
}
Output
Enter any Week day Number: Not a Day of Week



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