The line //if(date == 7){ fails to run the inner block and I don't understand why.

#include <stdio.h>

int main(void){
  int day,date,days,start_date,first_week_start;

  printf("\nEnter number of days in the month:");
  scanf("%d", &days);
  printf("Enter the day the calendar starts (Sun = 1, Sat = 7):");
  scanf("%d", &start_date);
  printf("\n");
  
  while(start_date > 1){
    printf("  ");
    start_date = start_date - 1;
    date = date   1;
  };

  for(day = 1; days >= day;   day,   date ){
    int day_of_the_week;
    // While the day of the week is less tha 7, number are printed
    // Once date 7 is met, prints on a new line and date is reset 
    printf("%d  ", day);
    //if(date == 7){  >>>Not Working
    if(date % 7 == 0){
      printf("Newline \n");
      date = 0;
    };
  };
};

CodePudding user response：

As the date variable is not initialized, you're encountering undefined behavior.

Strongly suggest you declare and initialize variables when you need them, and restrict the scope of variables when possible.