C Program To Display day from the date

C Program To Display day from the date

1.  //C Program To Display day from date By Tech Knowledge
3. #include <stdio.h>
4. #include <stdlib.h>
5. 
   
6. int main()
7. {
8.  
9.  int date,month,year,i,count=0,n=2000,z;
10.  int mo[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
11.  char slash;
12.  
13.   printf("\n***C Program To Display day from date***\n");
14.         printf("\nEnter the date in given format- Date/Month/Year");
15.         printf("\n\nEnter Date:- ");
16.         scanf("%d %c %d %c %d",&date,&slash,&month,&slash,&year);
17.  
18.     if((month>12 || month==0) || (date>31 || date==0) || (year>2099 || year<2000)|| slash!='/')
19.       {
20.             printf("Invalid date entered!\n\n");
21.        exit(0);
22.       }   
23.      
24.        else if((month==2 && date>29) || (month==4 && date>30) || (month==6 && date>30) || (month==9 && date>30) || (month==11 && date>30) )
25.         
26.       {
27.             printf("Wrong date entered");
28.        exit(0);
29.           }
30.          
31.          else 
32.        {
33.          
34.          while(n<year)
35.          {
36.           z=n;
37.           
38.          if(z%4==0)
39.           {
40.           count=count+366;
41.            
42.            }
43.            else
44.            {
45.          count=count+365;
46.          
47.          }
48.          n++;
49.           } 
50.         } 
51.         
52.          for(i=1;i<month;i++)
53.          {
54.              if(i==2 && year%4==0)
55.              mo[2]=29;
56.          count=count+mo[i];
57.          mo[2]=28;
58.          }
59.         
60.          count=count+date;
61.          count%=7;
62.          printf("\nDay Of Entered Date :- ");
63. 
    
64.  switch(count)
65.  {
66.   case 0:printf("Friday");break;
67.   case 1:printf("Saturday");break;
68.   case 2:printf("Sunday");break;
69.   case 3:printf("Monday");break;
70.   case 4:printf("Tuesday");break;
71.   case 5:printf("Wednesday");break;
72.   case 6:printf("Thursday");break;
73.   
74.  }
75. }

Compile & Run

Output

***C Program To Display day from date***

Enter the date in given format- Date/Month/Year

Enter Date:- 25/05/2020

Day Of Entered Date :- Monday

How Work this program?

The #include<stdlib.h> is a header file in c language that tells the compiler to include commands of stdlib.h file.

stdlib.h files added to use exit(0); function of its library.

On next line int main(), int is a return datatype of function and main() is function . Every program has main() function compulsory.

Every function in c program written in curly braces  '{'   '}' i.e in curly braces body of function will be written.

 int date,month,year,i,count=0,n=2001,z; this is variables having int datatype.

int mo[13]={0,31,29,31,30,31,30,31,31,30,31,30,31}; This 'mo' variable contains total days of every month .This mo[13] declared as a array.

 if((month>12 || month==0) || (date>31 || date==0) || (year>2099 || year<2001)|| slash!='/')  This if statement check the date entered by user in given form or not if user enter date in wrong format it gives Invalid date entered.

exit(0); Is a function of stdlib.h file. It tells the compiler to exit the program with the status 0.

Above for loop count days present in month . This loop repeated till i variable less than month.