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Title Program to find day when a date is given
Author P.Karthikeyan
Author Email p4karthikeyan [at] yahoo.com
Description This would calculate the day when date is given.
Category C » Beginners / Lab Assignments
Hits 366376
Code Select and Copy the Code
#include<stdio.h> main(){ int d,m,y,i; int r=0,r1=0,r2=0,s=0; input: printf(" Enter the DATE MONTH and YEAR "); scanf("%d %d %d",&d,&m,&y); if(m==2){ if((d>28)&&(y%4!=0)){ printf(" Fool,Invalid date in February of non leap year.The maximum value is 28"); goto input; } if((d>29)&&(y%4==0)){ printf(" Fool,Invalid date in February of leap year.The maximum value is 29"); goto input; } } else if((m==1)||(m==3)||(m==5)||(m==7)||(m==8)||(m==10)||(m==12)){ if(d>31){ printf(" Fool,Invalid date in %d th month.The maximum value is 31",m); goto input; } } else if(((m==4)||(m==6)||(m==9)||(m==11))&&(d>30)){ printf(" Fool,Invalid date in the %d th month.The maximum value is 30",m); goto input; } else if((d>31)){ printf(" Enter valid date "); goto input; } if((d<1)||(m<1)){ printf(" Fool,Enter positive valid data "); goto input; } else { switch(m){ case 1: case 10: r1=d+2; break; case 2: case 3: case 11: r1=d+5; break; case 4: case 7: r1=d+1; break; case 9: case 12: r1=d; break; case 5: r1=d+3; break; case 6: r1=d+6; break; case 8: r1=d+4; break; default: { printf(" Don't U know that there is no month greater than 12.Enter valid month Once again enter the Date Month Year "); goto input; } } } if(y<2003){ for(i=2002;i>=y;i--){ if((i==y)&&(i%4==0)){ if(m>2) s=s+1; else if(m<=2) s=s+2; break; } else if(i%4==0){ if(i%100==0){ if(i%400==0) s=s+2; else s=s+1; } else s=s+2; } else s=s+1; } r2=7-s%7; } else if(y>2003){ for(i=2004;i<=y;i++){ if((i==y)&&(i%4==0)){ if(m>2) s=s+2; else if(m<=2) s=s+1; break; } else if(i%4==0){ if(i%100==0){ if(i%400==0) s=s+2; else s=s+1; } else s=s+2; } else s=s+1; } r2=s%7; } else r2=0; r=(r1+r2)%7; printf(" "); switch(r){ case 0: printf("The Day is SUNDAY"); break; case 1: printf("The Day is MONDAY"); break; case 2: printf("The Day is TUESDAY"); break; case 3: printf("The Day is WEDNESDAY"); break; case 4: printf("The Day is THURSDAY"); break; case 5: printf("The Day is FRIDAY"); break; case 6: printf("The Day is SATURDAY"); break; } printf(" Thanks for using my program "); }

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