/*Name:-Bikram kumar pandit
  Roll:-10800220050
  Department:-Information Technology (IT).
  Sem:-2nd.
  College:-Asansol Engineering College.
  Activity Name:-Coding Solution.*/

#include <stdio.h>
int getFirstWeek(int year)
{
    int day;
    day=(((year-1)*365)+((year-1)/4)-((year-1)/100)+((year)/400)+1)%7;
    return day;
}
int main()
{
    int year;
    int dayInMonth;
    int Weekday;
    printf("enter the yera which you want:");
    scanf("%d",&year);
    char* months[]={"january","february","march","April","May","June","July","August","september","october","November","December"};
    int MonthDays[]={31,28,31,30,31,30,31,31,30,31,30,31};
    if((year % 4 == 0 && year % 100 != 0) || year % 400 ==0)
    {
        MonthDays[1]=29;
    }
    int StartingDays=getFirstWeek(year);
    for(int month=0;month<12;month++)
    {
        dayInMonth=MonthDays[month]+1;
        printf("\n\n----------------%s-----------------",months[month]);
        printf("\n Sun   Mon   Tue   Wed   Thrus   Fri   Sat\n");
        for(Weekday=0;Weekday<StartingDays;Weekday++)
        {
            printf("      ");
        }
            for(int day=1;day<dayInMonth;day++)
            {
                printf("%6d",day);
                if(++Weekday>6)
                {
                    printf("\n");
                    Weekday=0;
                }
                StartingDays=Weekday;
            }
    }
}
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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
}