I'm trying to make a simple clock using c. I want the values of the numbers to change alone without having to print the whole statement forever.

Output I'm looking for:

 Hour => {A changing number}
 Minute => {A changing number}
 Second => {A changing number}

I tried this:

    #include <stdio.h>
    int clock(int h,int m,int s){ 
            if(h<=60 && m<=60 && s<=60){
                    while(1){
                            s  ;
                            if(s>60){
                                    m  ;
                                    s = 0;    
                            }
                            if(m>60){
                                    h  ;
                                    m=0;
                            }
                            printf("Hour => %d\nMinute => %d\nSecond => %d\n",h,m,s);
                    }   
            }           
            return 0;
    }
    int main(){
            int h,m,s;
            printf("Enter an hour: \n");
            scanf("%d", &h);
            printf("Enter an minutes: \n");
            scanf("%d", &m);
            printf("Enter an seconds: \n");
            scanf("%d", &s);
            clock(h,m,s);
            return 0;
    }

Note: I'm a new computer science student and I'm new to c too so forgive me if I have some mistakes or methods that are not productive in my code.

CodePudding user response：

If you are willing to print the time on a single line instead of 3 lines, you can try like:

int my_clock(int h,int m,int s)
{
  if(h<=60 && m<=60 && s<=60)
  {
    while(1)
    {
      s  ;
      if(s>60)
      {
        m  ;
        s = 0;
      }
      if(m>60)
      {
        h  ;
        m=0;
      }

      // Go to start of current line
      printf("\r");

      // Overwrite all
      printf("                                                            ");

      // Go to start of current line
      printf("\r");

      // Print the new time
      printf("Hour => %d Minute => %d Second => %d ",h,m,s);
      fflush(stdout);

      // Wait 1 sec
      sleep(1);
    }
  }
  return 0;
}

I'm however not sure all terminals will support the \r as "Go to start of current line"