download turboc++ from here (nvstech.weebly.com)

basically there are two types of variables

1= float means (decimals value like 1.2 , 8.2)
2= int means (fixed values 2 ,5 ,5 )

program no 1:

how to calculate percentage of 3 input marks....

#include<stdio.h>
#inlcude<conio.h>

void main()

{

  int m1;

  int m2;

  int m3;

  int sum;

  clrscr();

  float percentage;
  printf("enter marks1:");

  scanf("%d",&m1);
  printf("enter marks2:");

  scanf("%d",&m2);
  printf("enter marks3:");

  scanf("%d",&m3);

  sum=m1+m2+m3;

  percentage=sum/300.0*100;

  printf("sum=%d",sum);

  printf("perce%f",percentage);
  getch();

  }

here percentage is floar value (like 89.7% ) so we use "f"

and marks are basically in integers values like ( 56 out 100) so we "d".

now i am compiling this program

then runiing

scanf means (input value )

we use [clrscr();] always after declarations
declarations means (

  int m2;

  int m3;

  int sum;)

and [getch();]

always in the end before closing curly brackets)

program no 2:

how to calculate length:

first step declare values or variables we use :

#include<stdio.h>
#inlcude<conio.h>

void main()
{
   float length,area;
   printf("enter lenght:");
   scanf("%f", &length);
   area=lenght*length;
   printf("area =%f", lenght);
   getch();
 }
here area and lenght both are float values like (9.7m ) or area = 8.9sqm


now  similary u can calculate area of rectangle
area=length*breadth

now here 3 variables are available

length
breadth
area

#include<stdio.h>
#inlcude<conio.h>

void main()
{
   float length,breadth,area;
   clrscr();
   printf("enter lenght:");
   scanf("%f", & lenght);
   printf(enter breadth:");
   scanf("%f", &breadth);
   area=lenght*breadth;
   printf("area=%f", area);
   getch();
}

points to remember:

1) always use (;)  after every step

2)each time when u write scanf u will have to input values 

3) use (&) only in scanf not in printf like above 

4) (scanf then formula then printf) step by step

program no3:

how to convert km into meter

steps: scanf then formula then printf

#include<stdio.h>
#include<conio.h>
void main()
{
  float km;
  clrscr();
  printf("enter km:");
  scanf("%f", &km);
  m=km*1000.0;
  printf("m=%f",m);
  getch();
}

program no 4:

convert km into feets:

  

#include<stdio.h>
#include<conio.h>
void main()
{
  float km,feet;
  clrscr();
  printf("enter km:");
  scanf("%f", &km);
  feet=km*3280.6;
  printf("feet=%f", feet);
  getch();
}

program no 5:

how to calculte table of any number

#include<stdio.h>
#include<conio.h>
void main()
{
  int a,b,c,d,e,f,g,h,i,j;
  clrscr();
  printf("enter no:");
  scanf("%d",&a);
  b=a*2,c=a*3,d=a*4,e=a*5,f=a*6,g=a*7,h=a*8,i=a*9,j=a*10;
  printf("%d\n",a);
  printf("%d\n",b);
  printf("%d\n",c);
  printf("%d\n",d);
  printf("%d\n",e);
  printf("%d\n",f);
  printf("%d\n",g);
  printf("%d\n",h);
  printf("%d\n",i);
  printf("%d\n",j);
  printf("Wow! DAniyal (=");
  getch();
}

program no 7

convert farenheit into centigrade

here f and c are integers dats  y i take both of them in (d) instead of (f)

program no 5:

 stay connect for more :)