output:Code:#include <stdio.h> void getMonthYear(int *month, int *year); int toJulian(int month, int day, int year); int daysInMonth(int month, int year); int leapYear(int year); long yearsToDays(int year); void printCalendar(int startDay, int numDays); void printHeader(); #define MAX_COL 7 //#define JAN_1_1900_START_DAY 2 //starts on Monday //#define JAN_1_1900_START_DAY_OFFSET (JAN_1_1900_START_DAY-1) //Since Sunday is day 1 void main(void)//1 jan 1900= julian day 1, use julian day to calculate month day etc with remainder function { int month, year, startDay, numDays; getMonthYear(&month, &year); //added 1 below because 1-1-1900 starts on a monday startDay = (toJulian(month, 1, year) + yearsToDays(year)) % 7;//1/1/1900 starts on monday, offset goes outside the order of ops here numDays = daysInMonth(month, year); printCalendar(startDay, numDays); } void getMonthYear(int *month, int *year) { printf("Enter month: "); scanf_s("%d", month);//don't put pointer * in here, already a pointer from above /*do{ printf("You entered an invalid month"); }while(*month < 1 || *month > 12);*/ printf("Enter year: "); scanf_s("%d", year); } int toJulian(int month, int day, int year)//can't return bigger than 366 { switch(month-1)// needs2calc month b4 the one of input {//don't hardcode? //case 12: day += 31;//dec case 11: day += 30;//nov case 10: day += 31;//oct case 9: day += 30;//sep case 8: day += 31;//aug case 7: day += 31;//july case 6: day += 30;//june case 5: day += 31;//may case 4: day += 30; //apr case 3: day += 31; //mar case 2: day += 28 + leapYear(year);//feb case 1: day += 31;//jan } return day; } int daysInMonth(int month, int year) { switch(month) {//don't hardcode? case 12: return 31;//dec case 11: return 30;//nov case 10: return 31;//oct case 9: return 30;//sep case 8: return 31;//aug case 7: return 31;//july case 6: return 30;//june case 5: return 31;//may case 4: return 30; //apr case 3: return 31; //mar case 2: return (28 + leapYear(year));//feb case 1: return 31;//jan } return 0;//put excredit here maybe } int leapYear(int year)//put 2 conditions 1 for centenials one for noncenttentials { if(year % 400 == 0 || (year % 100 != 0 && year % 4 == 0))//make 100&400 centeial conditions 1 and 2 return 1; else return 0; } long yearsToDays(int year) { long juliandays = 0; int julianyr; for(julianyr = 1900; julianyr < year; julianyr++)//years to days f() { juliandays += (365 + leapYear(julianyr));//or day= } //add 365 or 366 from leap years return juliandays;//put extra cred here maybe } void printCalendar(int startDay,int numDays) {//print 1 day@time, \n after sat int column, showdays; printHeader(); for (column = 0; column < startDay; ++column) { printf(" 0"); } for(showdays = 1; showdays <= numDays; showdays++) { if(column <= MAX_COL) { printf("%3d", showdays); } else if(column >= MAX_COL) { printf("\n"); column = 0; } column++; } //wrong somewhere }

the 3 is not in the right spot(it should be in the next line under Su), i have been working 3 hours trying to figure out how to fix this thing manipulating only my printCalendar(int startDay,int numDays) function, and i'm going insaneCode:Enter month: 4 Enter year: 2011 Su M Tu W Th F Sa 0 0 0 0 0 1 2 3 5 6 7 8 9 10 11 13 14 15 16 17 18 19 21 22 23 24 25 26 27 29 30Press any key to continue . . .