C programming

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