Program to calculate area of triangle by Heron's formula:
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Program:
#include<stdio.h>
#include<math.h>
int main()
{ float a,b,c,s,area;
printf("Enter three sides of triangle:");
scanf("%f%f%f",&a,&b,&c);
s=(a+b+c)/2;
area=sqrt((s*(s-a)*(s-b)*(s-c)));
printf("Area is = %.2f",area);
return 0;
}
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#basicprograms

Program to calculate distance between two points.
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Program:
#include<stdio.h>
#include<math.h>
int main()
{ float x1,x2,y1,y2,distance;
printf("Enter coardinates of first point(x1,y1):\n");
scanf("%f%f",&x1,&y1);
printf("Enter coordinates of second point(x2,y2):\n");
scanf("%f%f",&x2,&y2);
distance=sqrt(pow((x2-x1),2)+pow((y2-y1),2));
printf ("Distance=%.2f",distance);
return 0;
}
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#basicprograms

Program to print asci value of the character:
----------------------------------------------------
#include<stdio.h>
int main()
{char ch;
printf("Enter any character:");
scanf("%c",&ch);
printf("The ascii value of %c is %d",ch,ch);
return 0;
}
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#basicprograms

Program to accept any Character in upper case and print it in lowercase.
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Program:
#include<stdio.h>
int main()
{char ch;
printf("Enter any character(Upper Case):");
scanf("%c",&ch);
printf("Lower case character= %c",ch+32);
return 0;
}
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#basicprograms

Program to accept lower case character and print it in uppercase
----------------------------------------------------
Program:
#include<stdio.h>
int main()
{char ch;
printf("Enter any character(Lower case):");
scanf("%c",&ch);
printf("Upper case character= %c",ch-32);
return 0;
}

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#basicprograms

Program to print digit at one's place
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Program:
#include<stdio.h>
int main()
{int num,digit;
printf("Enter any number:");
scanf ("%d",&num);
digit=num%10;
printf("The digit at one's place of %d is %d",num,digit);
return 0;
}
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#basicprograms

Program to swap two numbers using third variable
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Program:
#include<stdio.h>
int main()
{int a,b,temp;
printf("Enter a=");
scanf ("%d",&a);
printf("Enter b=");
scanf("%d",&b);
printf("Before Swapping:\n");
printf("a=%d\nb=%d",a,b);
temp=a;
a=b;
b=temp;
printf("\nAfter Swapping:");
printf("\na=%d\nb=%d",a,b);
return 0;
}
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#basicprograms

Program to swap two numbers without using third variable
----------------------------------------------------
Program:
#include<stdio.h>
int main()
{int a,b;
printf("Enter a=");
scanf ("%d",&a);
printf("Enter b=");
scanf("%d",&b);
printf("Before Swapping:\n");
printf("a=%d\nb=%d",a,b);
a=a+b;
b=a-b;
a=a-b;
printf("\nAfter Swapping:");
printf("\na=%d\nb=%d",a,b); return 0;
}
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#basicprograms

Program to calculate average of two numbers and print their deviation
----------------------------------------------------
Program:
#include<stdio.h>
int main()
{int a,b;
float avg,d1,d2;
printf("Enter first number=");
scanf ("%d",&a);
printf("Enter second number=");
scanf("%d",&b);
avg=(a+b)/2;
d1=a-avg;
d2=b-avg;
printf("Average=%.2f\n",avg);
printf("Deviation of 1st number (i.e %d) is=%.2f",a,d1);
printf("\nDeviation of 2nd number (i.e %d) is=%.2f",b,d2);
return 0;
}
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#basicprograms

Program to know the size of data type
----------------------------------------------------
Program:
#include<stdio.h>
int main()
{
printf("Size of int:%d bytes\n",sizeof(int));
printf("Size of float:%d bytes\n",sizeof(float));
printf("Size of char:%d bytes\n",sizeof(char));
printf("Size of double:%d bytes\n",sizeof(double));
return 0;
}
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#basicprograms

Program to convert floating point number into int.
----------------------------------------------------
Program:
#include<stdio.h>
int main()
{float a;
int b;
printf("enter floating point number:");
scanf("%f",&a);
b=(int)a;
printf("%d",b);
return 0;
}
----------------------------------------------------
#basicprograms