C-programs

INTRODUCTION PROGRAMS

 1)

#include<stdio.h>
main()
{
    int x=10;
    printf("x:-%d\n",x);

}
/*
output
x:-10
*/

2)

#include<stdio.h>
main()
{
    float x=1.23;
    printf("x:-%f\n",x);
}
/*
output
x:- 1.230000
*/

3)

#include<stdio.h>
main()
{
    char x='v';
    printf("x:-%c\n",x);
}
/*
output
x:- v
*/

4)simple program about scanf
#include<stdio.h>
main()
{
    char x;
    int y;
    float z;
    printf("enter char,interger ,float value\n");
    scanf("%c",&x);
    scanf("%d",&y);
    scanf("%f",&z);
    printf("-------------\n");
    printf("%c\n%d\n%f\n",x,y,z);
}

5)write a program to add two numbers
#include<stdio.h>
main()
{
    int x,y,z;
    printf("enter the two numbers\n");
    scanf("%d%d",&x,&y);
    z=x+y;
    printf("***output***\n");
    printf("z:-%d\n",z);
}

6)write a program to print area of cirlce
#include<stdio.h>
main()
{
    int r;
    float a;
    printf("enter radius\n");
    scanf("%d",&r);
    a=3.14*r*r;
    printf("area of the cirlce:%f\n",a);
} 

7)write a program swapping or inter change two numbers(using third variable)
#include<stdio.h>
main()
{
    int x,y,t;
    printf("enter two numbers\n");
    scanf("%d%d",&x,&y);
    printf("Before changing\n");
    printf("x:%d y:%d\n",x,y);
    t=x;
    x=y;
    y=t;
    printf("After changing\n");
    printf("x:%d y:%d\n",x,y);
}

8)write a program swaping or inter changing two numbers (without using third variable)
#include<stdio.h>
main()
{
    int x,y;
    printf("enter two numbers\n");
    scanf("%d%d",&x,&y);
    printf("Before changing\n");
    printf("x: %d y: %d\n",x,y);
    x=x+y;
    y=x-y;
    x=x-y;
    printf("After changing\n");
    printf("x:%d y:%d\n",x,y);
   
}

9)write a program to add,sub,multi,divide and find remainder of the two numbers
#include<stdio.h>
main()
{
    int x,y,a,b,c,e;
    float d;
    printf("enter two numbrs\n");
    scanf("%d%d",&x,&y);
    a=x+y;
    b=x-y;
    c=x*y;
    d=x/(float)y;
    e=x%y;
    printf("add:%d sub:%d mul:%d divide:%f reminder:%d\n",a,b,c,d,e);
}

10)Pre-increment & Post-increment
//Pre-decrement & Post-decrement
#include<stdio.h>
main()
{
    int x = 10;
    printf("Pre-increment & Post-increment");
    printf("x :%d\n",x);
    printf("x :%d\n",x++);
    printf("x :%d\n",x);
    printf("x :%d\n",++x);
    printf("x :%d\n",x);
    printf("x :%d\n",x);
    printf("x :%d\n",++x);
    printf("x :%d\n",x);
    printf("x :%d\n",x++);
    printf("x :%d\n",x);
    printf("Pre-decrement & Post-decrement");
    printf("x :%d\n",x);
    printf("x :%d\n",x--);
    printf("x :%d\n",x);
    printf("x :%d\n",--x);
    printf("x :%d\n",x);
    printf("x :%d\n",x);
    printf("x :%d\n",--x);
    printf("x :%d\n",x);
    printf("x :%d\n",x--);
    printf("x :%d\n",x);
}

 LOOPS

      IF-ELSE

11)Write a program to check the given no is positive. (using if)
#include<stdio.h>
main()
{
    int x;
    printf("enter any number\n");
    scanf("%d",&x);
    if(x>0)
    {
        printf("%d IS POSSITIVE NUMBER\n",x);

    }
}  

12)Write a program to check the given no is even. (using if)
#include<stdio.h>
main()
{
    int x;
    printf("enter any number\n");
    scanf("%d",&x);
    if(x%2==0)
    {
        printf("%d is even\n",x);
    }
}

13)Write a program to check the given no is positive or negative. (using if-else)
#include<stdio.h>
main()
{
    int x;
    printf("enter any number\n");
    scanf("%d",&x);
    if(x>0)
    {
        printf("%d positive number\n",x);
    }
    else
    {
        printf("%d negative number\n",x);
    }
}

14)Write a program to check the given no is even or odd. (using if-else)
#include<stdio.h>
main()
{
    int x;
    printf("enter any number\n");
    scanf("%d",&x);
    if(x%2==0)
    {
        printf("%d is even\n",x);
    }
    else
    {
        printf("%d is odd\n",x);
    }
}

15)Write a program to print greatest of two nos. (using if-else)
#include<stdio.h>
main()
{
    int s,g;
    printf("enter two numbers\n");
    scanf("%d%d",&s,&g);   
    if(s>g)
    {   
        printf("%d is greatest\n",s);
    }
    else
    {
        printf("%d is greatest\n",g);
    }
}

16)Write a program to check the given two nos are equal or not equal. (using if-else)
#include<stdio.h>
main()
{
    int g,s;
    printf("enter two numbers\n");
    scanf("%d%d",&g,&s);
    if(s==g)
    {
        printf("equal\n");
    }
    else
    {
        printf("not equal\n");
    }   
}

17)Write a program to print greatest of three nos. (using nested - if)
#include<stdio.h>
main()
{
    int x,y,z;
    printf("enter three numbrs\n");
    scanf("%d%d%d",&x,&y,&z);
    if(x>y && x>z)
    {   
        printf("%d ids greatest\n",x);
    }
    else
    {
        if(y>z)
        {
            printf("%d is greatest\n",y);
        }
        else
        {
            printf("%d is greatest\n",z);
        }
    }
}

18)Write a program to find total, average & grade of the student when three subjects are given.
#include<stdio.h>
main()
{
    int s1,s2,s3,total;
    float percentage;
    printf("enter three subjects marks\n");
    scanf("%d%d%d",&s1,&s2,&s3);
    total=s1+s2+s3;
    percentage=total/3.0;
    printf("s1:%d\n",s1);
    printf("s2:%d\n",s2);
    printf("s3:%d\n",s3);
    printf("total:%d\n",total);
    printf("percentage:%f\n",percentage);
    if(s1>=35&&s2>=35&&s3>=35)
    {
        if(percentage>=75)
        {
            printf("distinction\n");

        }
        else
        {
            if(percentage>=60)
            {
                printf("1st class\n");

            }
            else
            {
                    if(percentage>=50)
                    {
                        printf("2nd class\n");

                    }
                    else
                    {
                        printf("3rd class\n");

                    }

            }
                   
        }
    }
    else
    {
        printf("fail\n");
    }
}