First.c
#include<stdio.h>
int main() {
int a;
printf("Enter a number: ");
scanf("%d",&a);
printf("You entered %d .",a);
return 0;
}
Theory
#include<stdio.h>
#include<math.h>
#define pi 3.1415
int main()
{
// float a=pow(pi,3);
// printf("%f\n",a);
// float a;
// typedef float dec;
// dec b;
/*
Charecter Sets:
1. alphabets: A,B ... Z, a,b,...z
2. numbers -1,2,3,...9,0
3. special character: ,,.,#,<,>,+,-
4. white space: sapce, horizental tab, new line
Identifiers:
int rollno;
char name;
keyword: int, char, if, if else, else, for, while, do, return;
Data Types:
primary: int, char, float, double, void
int a;
char name,lname;
user defined: typedef float dec;
derived data type:
struct var1{
int sn;
char name[10];
double phoneno;
}
Constant:
int sn = 5;
char name[6] = "Subash";
sn++;
variable:
int sn;
char name[];
Preprocessor directive:
pow(2,5);
escape sequence:
*/
printf("Program run successfully.");
return 0;
}
printf()
#include<stdio.h>
int main()
{
char a[] = "Subash";
printf(" value of a is %s.",a);
return 0;
}
scanf()
#include<stdio.h>
int main()
{
char name[10];
printf("Enter your name: ");
scanf("%s",&name);
// operation
printf("Hi %s",name);
}
Airthmetics Operator
#include<stdio.h>
int main()
{
// +, -, *, / ,%
// int a=3,b=4;
printf("mode = %d",10%5);
}
Unary Operator
#include<stdio.h>
int main()
{
int x=9;
printf("result = %d\n",x--);
printf("result = %d",x);
}
Binary Operator
#include<stdio.h>
int main()
{
printf("%d ",4*5);
}
Ternary Operator
#include<stdio.h>
int main()
{
// int a=0,b=10,c=20;
// condional operator result=condition?true:false;
// printf("%d",a?b:c);
int a= 30;
int b =20;
int max;
max = (a>b)?a:b;
printf("%d ",max);
}
Division Rule
#include<stdio.h>
int main()
{
/* int, float
int/int = int
float/int, int/float, float/float = float
*/
printf("%d",-1/4);
// truncation rule. -9,......,-2,-1,0,1,2,3, ........9
}
Relational Operator
#include<stdio.h>
int main()
{
printf("%d\n",2>3);
printf("%d\n",2<3);
printf("%d\n",2<=3);
printf("%d\n",2<=2);
printf("%d\n",2!=2);
}
// >,<,>=,<=,==,!=
// 2>3 => 0
// 2<3 => 1
Logical Operator
#include<stdio.h>
int main()
{
printf("It is %d",!(2<3));
}
// And (&&), Or (||), Not (!a)
// 0 => False
// 1 => true
Assignment Operator
#include<stdio.h>
int main()
{
// int a;
// char b;
// a = (2+3-4*8/16);
// a=2;
// b= 'c';
// +=, -=, *=, /=, %=
// a+=b => a=a+b
// a-=b => a=a-b
// a*=b => a=a*b
// a/=b => a=a/b
// a%=b => a=a%b
int a=9;
// a-=6; // => a=a-6
// a*=6; // => a=a*6
a%=6; // => a=a%6
printf("%d",a);
}
Increment / Dectrmenet Operator
#include<stdio.h>
int main()
{
// --, ++
int a=5;
printf("%d\n",a--);
printf("%d",a);
}
Conditional Operator
#include<stdio.h>
int main()
{
int a;
a = 2<3 ? 2 : 3;
printf("%d",a);
}
// value = condition ? true_expression : false_expression;
Bitwise Logical Operators
#include<stdio.h>
int main()
{
int a=15, b=10;
printf("%d",a^b);
}
// AND, OR, XOR
// 15 => F => 1111(binary)
// a=15 => 0000 0000 0001 0101
// b=10 => 0000 0000 0001 0000
// a^b => 0000 0000 0000 0101 =>0005
// a|b => 0000 0000 0001 0101 =>0015
// a&b => 0000 0000 0001 0000 =>0010
Bitwise Shift Operators
#include<stdio.h>
int main()
{
int a=14;
printf("%d",a>>1);
}
//0000 0000 0001 0100 => 0000 0000 0000 1010 =>10 -1,-2,-3,-4,-5,-6,-7
// 0000 1010 1001 1100 <<
// 0001 0101 0011 1000 >>
Bitwise One's Complement Operator
#include<stdio.h>
int main()
{
int a=15;
printf("%d",~a);
return 0;
}
// 1001 => 0110
// 0101 => 1010 = 10(-6) 1000
// ~n
Specianl Operators
1. Comma Operator
#include<stdio.h>
int main()
{
int sum,a,b;
// sum =(a=5,b=6,a+b);
printf("%d",sum);
return 0;
}
2. sizeof() Operator
#include<stdio.h>
int main()
{
// int,char,arry, => 0
int a;
printf("%d",sizeof(float));
return 0;
}
Precedence and Associativity
// Precedence and Associativity
#include<stdio.h>
int main(){
int a = 2+4-6/8*9;
return 0;
}
Type Conversion (Type Casting)
// Data Type Conversion / Type Casting
#include<stdio.h>
int main(){
int a = 1;
float b = 10.34;
int c = a+b; //a=1=> 1.0000+10.34 = 11.34
// Implicit Type Conversion
printf("%d",c);
// Explicit Type Conversion
float a;
a = (float)10/3;
printf("%f",a);
return 0;
}
