C programming

#include void main() { FILE *fpin,*fpout; int a,i,j,m=0,mon,l,k; fpin=freopen("c:\\TC\\work\\a.in","r",stdin); fpout=freopen("c:\\TC\\work\\a.out","w",stdout); while(scanf("%d",&a)==1) { for(i=1;i<=a;i++) { if(i==a) printf("\n YEAR %d ",i); for(j=1;j<=12;j++) { if(i%4==0&&j==2) mon=29; else if(j==2) mon=28; else if(j==1||j==3||j==5||j==7||j==8||j==10||j==12) mon=31; else mon=30; if(j==1&&i==a) printf("\n\n JANUARY "); else if(j==2&&i==a) printf("\n\n FEBRUARY "); else if(j==3&&i==a) printf("\n\n MARCH "); else if(j==4&&i==a) printf("\n\n APRIL "); else if(j==5&&i==a) printf("\n\n MAY "); else if(j==6&&i==a) printf("\n\n JUNE "); else if(j==7&&i==a) printf("\n\n JULAY "); else if(j==8&&i==a) printf("\n\n AUGUST "); else if(j==9&&i==a) printf("\n\n SEPTEMBER "); else if(j==10&&i==a) printf("\n\n OCTOBER "); else if(j==11&&i==a) printf("\n\n NOVEMBER "); else if(j==12&&i==a) printf("\n\n DECEMBER "); if(i==a) { printf("\n SUN MON TUE WED THU FRI SAT\n"); printf(" "); } for(l=1;l<=m;l++) { if(i==a) printf(" "); } for(k=1;k<=mon;k++) { if(i==a) { printf("%2d ",k); } m++; if(m==7) { if(i==a) { printf("\n"); printf(" "); } m=0; } } // printf("\n"); } // printf("\n%d",a*3); } } }