Calculating your telephone bill

/* NOTE :- If we want to make a few line as comment then we can write those statements within /* this pair of combinaction of . */

/* calls <= 100 charges 2/- per call calls <= 300 charges 3.5/- per call calls <= 500 charges 4.5/- per call calls >; 500 charges 5/- per call */

#include<stdio.h>;
void main()
{
int calls;
float amount;

printf("Enter Number of calls :");
scanf("%d",&calls);

printf("Number of calls is %d and nyou have to pay ",calls);

if ( calls <= 100 )
    amount = calls*2;
else if ( calls <= 300 )
{
    amount = 100*2;
    calls = calls-100;
    amount = amount + calls*3.5;
    // or amount = 100*2 + (call-100)*2;
}
else if ( calls <= 500 )
{
    amount = 100*2;
    amount = amount + 200*3.5;
    calls = calls-300;
    amount = amount + calls*4.5;
    // or amount = 100*2 + 200*2 + (calls-300)*4.5;
}
else if ( calls >; 500 ) // or else
{
    amount = 100*2;
    amount = amount + 200*3.5;
    amount = amount + 200*4.5;
    calls = calls-500;
    amount = amount + calls*5;
    // or amount = 100*2 + 200*3.5 + 200*4.5 + (calls-500)*5;
}
printf(" %.2f Rs.",amount);
}

OUTPUT

1.

Enter Number of calls :100
Number of calls is 100 and
you have to pay 200.00 Rs.

2.

Enter Number of calls :2345
Number of calls is 2345 and
you have to pay 11025.00 Rs.

SO WE ARE ENDING NESTING IF-ELSE HERE YOU CAN PRECTICE MORE QUECTION ON IT AT HOME.