#include <stdio.h>

int main() {
  int number_of_appliances;
  float power_rating[10], daily_usage[10], daily_units[10], total_daily_units = 0, monthly_units, unit_rate, total_bill;

  printf("Enter the number of appliances: ");
  scanf("%d", &number_of_appliances);

  for (int i = 0; i < number_of_appliances; i++) {
    printf("Enter the power rating of appliance %d: ", i + 1);
    scanf("%f", &power_rating[i]);

    printf("Enter the daily usage of appliance %d (in hours): ", i + 1);
    scanf("%f", &daily_usage[i]);

    daily_units[i] = power_rating[i] * daily_usage[i] / 1000;
  }

  for (int i = 0; i < number_of_appliances; i++) {
    total_daily_units += daily_units[i];
  }

  monthly_units = total_daily_units * 30;

  if (monthly_units < 50) {
    unit_rate = 6;
  } else if (monthly_units >= 50 && monthly_units < 200) {
    unit_rate = 8;
  } else {
    unit_rate = 10;
  }

  total_bill = monthly_units * unit_rate;

  printf("\nElectricity Bill\n");
  printf("------------------\n");
  printf("Appliance Name\tPower Rating\tDaily Usage\tDaily Units\n");

  for (int i = 0; i < number_of_appliances; i++) {
    printf("Appliance %d\t%.2f W\t\t%.2f h\t\t%.2f kWh\n", i + 1, power_rating[i], daily_usage[i], daily_units[i]);
  }

  printf("\nTotal Daily Units: %.2f kWh\n", total_daily_units);
  printf("Total Monthly Units: %.2f kWh\n", monthly_units);
  printf("Unit Rate: Rs. %.2f per kWh\n", unit_rate);
  printf("Total Bill: Rs. %.2f\n", total_bill);

  return 0;
}

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Read inputs from stdin

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#include <stdio.h>
int main()
{
    char name[50];
    printf("Enter name:");
    scanf("%s", name);
    printf("Hello %s \n" , name );
    return 0;
    
}

About C

C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.

Key features:

  • Structured Programming
  • Popular system programming language
  • UNIX, MySQL and Oracle are completely written in C.
  • Supports variety of platforms
  • Efficient and also handle low-level activities.
  • As fast as assembly language and hence used as system development language.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition if-else is used.

if(conditional-expression) {
   // code
} else {
   // code
}

You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to if-else-if ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {  
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Two types of functions are present in C

  1. Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

  1. User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

How to declare a Function

return_type function_name(parameters);

How to call a Function

function_name (parameters)

How to define a Function

return_type function_name(parameters) {  
  //code
}