Flow Of Control Examples

While Example

#include <conio.h>
#include <stdio.h>
void main()
{
   clrscr();
   int n1,n2 ;
   int  no_of_games,no_of_points,no_of_goals  ;
   float average;
   no_of_games=no_of_points=no_of_goals=0;
   while(1)
   {
     printf("Please enter first number==>");
     scanf("%d",&n1);
     printf("Please enter second number==>");
     scanf("%d",&n2);
     if  (n1==-1  &&  n2==-1)
         break;
     no_of_games++;
     no_of_goals +=n1;
     if (n1 >  n2)
          no_of_points +=3;
     else
          no_of_points++;
     }
     printf("No of points = %d\n",no_of_points);
     printf("no_of_games = %d\n",no_of_games);
     average=float(no_of_goals)/float(no_of_games);
     printf("Average no of goals per play = %2.1f",average);
 
}

The program gets long integer and check:

if num. of digits is even tells how many odd digits are

if num. of digits is odd tells how many even digits are

#include<stdio.h>
int main(void)
{
   int even=0,odd=0,i;
   long number;
   printf(“Please enter the number\n”);
   scanf(“%ld”,&number);
   do
   {
      if(!(number%2))
         ++even;
      else
         ++odd;
      number/=10;
   }while(number);

    if(!((odd+even)%2))
        for(i=1;i<=odd;++i) 
            putchar('*'); 
    else 
        for(i=1;i<=even;++i) 
           putchar('?'); 
    return 0; 
} 

A fine example of using the case condition:
This program gets an arithmetic problem containing the 4th operation + – * /
gives the result after =
when the result is zero or the user types only '=': the program stops.
wrong input causes an alert

#include <stdio.h>  
#include <stdlib.h>
void main(void)
{
    char c;
    int last_op;
    int error,was_dot;
    double next,result,power;
    do{
        result=next=was_dot=0;
        power=1; last_op='+';
        do{
        error=0;
        switch (c=getch())
        {
                        /*digit*/
            case '0':
            case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9': if(was_dot)
                    next+=(power/=10)*(c-'0');
                  else
                    next=next*10+(c-'0');
                  break;
 
                            /*dot*/
 
            case '.': if(was_dot)
                        error=1;
                    else
                        was_dot=1;
                    break;
 
                        /*delim*/
 
            case '+':
            case '-':
            case '*':
            case '/':
            case '=': switch (last_op)
                    {
                    case '+':
                         result+=next;
                         break;
                    case '-':
                         result-=next;
                         break;
                    case '*':
                         result*=next;
                         break;
                    case '/':
                         if(next)
                            result/=next;
                         else
                            error=1;
                         break;
                    }
                 if(!error)
                 {
                    next=was_dot=0;
                    power=1; last_op=c;
                 }
                 break;
             default:
                    error=1;
        }
        if(error)
            printf("\a");
        else
            putch(c);
        }while (error || (c!='='));
        printf("%g\n",result);
    }while(result);
    printf("Have a nice day.\n");
}

find max and min for a sequence of numbers

#include <limits.h>
#include <conio.h>
#include <stdio.h>
#define TRUE 1
#define EXIT -9999
void main()
{
   clrscr();
   int n,max,min;
   max=INT_MIN; min=INT_MAX;
   printf("Enter integer numbers in the range:" );
   printf("%d   %d",INT_MIN,INT_MAX);
   printf("\nto exit enter ==> %d\n", EXIT);
   do
     {
      printf("Enter next  ==>");
      scanf("%d",&n);
      if( n==EXIT )
     break;
      if ( n > max )
     max=n;
      if ( n < min )
     min= n;
    }
   while(TRUE);
   printf("max=%d   min=%d",max,min);
 
}

Fibonacci Numbers

#include <conio.h>
#include <stdio.h>
void main()
{
   int  i;
   int n;
   int an,an_1,an_2;
   an=1;
   an_1=0;
   an_2=0;
   clrscr();
   printf("Enter an integer > 2===>");
   scanf("%d",&n);
   for (i=1;an<n;i++)
   {
     printf("a(%d) = %d\n",i,an);
     an_2 = an_1;
     an_1 = an;
     an=an_1+an_2;
   }
}

Another Example

#include <conio.h>
#include <stdio.h>
void main()
{
   int n;
   int BestCar;
   int BestResult=-1;
   int i,age,last_position,result;
   char model;
   clrscr();
   printf("Enter no of cars in the race ==>");
   scanf("%d",&n);
   for(i=1; i<=n;i++)
     {
       printf("Enter (%d)'s car :age ,model,last position  ->",i);
       scanf("%d %c %d",&age,&model,&last_position);
       if (age >10)
     { printf("illegal age-- try a number between 0 and 10\n");
       i--;
       continue;
     }
       if (model!='A' && model != 'B' && model != 'C')
      {
        printf("illegal model try A or B or C\n");
        i--;
        continue;
      }
       result=(10-age) +(3- (model - '@'))+(10-last_position);
               /* notice the ascii letter before 'A' is '@'  */
       if (result > BestResult)
     {
      BestResult= result;
      BestCar=i;
     }
       if (last_position<1 || last_position >10)
      {
        printf("illegal last position try 1 to 10\n");
        i--;
        continue;
      }
 
 
     }
     printf("The best car is %d with the score of: %d",BestCar,BestResult);
}

Multiplication Table

#include <conio.h>
#include <stdio.h>
void main()
{
   int i,j,k;
   clrscr() ;
   printf("           multiplication  table\n     \332");
   for ( k=1; k<=10 ;k++)printf("\304\304\304\302");
   printf("\n     \263");
   for(k=1;k<=10;k++) printf("%3d\263",k);
   printf("\n  ");
   for ( k=1; k<=11 ;k++)printf("\304\304\304\305");
   for (i=1; i<=10; i++ )
     {
    printf("\n%3d  \263",i );
    for (j=1; j<=10 ; j++)
    printf("%3d\263",i*j);
    printf("\n  ");
    for ( k=1; k<=11 ;k++)printf("\304\304\304\305");
     }
}

Another Example:

#include <conio.h>
#include <stdio.h>
void main()
{
   int i,j;
   clrscr() ;
   printf("           multiplication  table\n");
   printf
      ("----------------------------------------------\n");
   printf
     ("     | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10|   \n");
   printf
      ("----------------------------------------------\n");
   for (i=1; i<=10; i++ )
     {
      printf("%3d  |",i );
      for (j=1; j<=10 ; j++)
    printf("%3d|",i*j);
      printf("\n");
     }
}

Yet Another Example

#include <conio.h>
#include <stdio.h>
#define HORIZONTAL_LINE    196
#define VERTICAL_LINE      179
#define PLUS               197
#define LEFT_UPPER_CORNER  218
#define RIGHT_UPPER_CORNER 191
#define LEFT_LOWER_CORNER  192
#define RIGHT_LOWER_CORNER 217
#define T                  194
#define RIGHT_T            180
#define LEFT_T             195
#define OPPOSITE_T          193
 
void DrawLine(int no_of_columns,
         int left_char,int middle_char,int right_char);
void main()
{
   int no_of_columns;
   int i,j,k;
   clrscr() ;
   printf("Enter no of columns( 3-11) ==>");
   scanf("%d",&no_of_columns);
   clrscr();
   printf("           multiplication  table\n\n  ");
 
/*----------------------------first 3 lines  ---------------*/
   DrawLine (no_of_columns,LEFT_UPPER_CORNER,T,RIGHT_UPPER_CORNER);
   printf("\n  %c   %c",VERTICAL_LINE,VERTICAL_LINE);
   for(k=1;k<=no_of_columns;k++) printf("%3d%c",k,VERTICAL_LINE);
   printf("\n  ");
   DrawLine (no_of_columns,LEFT_T,PLUS,RIGHT_T);
 
 
/*----------------------------table contents ----------------*/
   for (i=1; i<=no_of_columns; i++ )
     {
    printf("\n  %c%3d%c",VERTICAL_LINE,i,VERTICAL_LINE );
    for (j=1; j<=no_of_columns ; j++)
        printf("%3d%c",i*j,VERTICAL_LINE);
    printf("\n  ");
     DrawLine (no_of_columns,LEFT_T,PLUS,RIGHT_T);
     }
 
 
/*-------------------------correct  last line----------------*/
       printf("\r  ");
       DrawLine
     (no_of_columns,LEFT_LOWER_CORNER,OPPOSITE_T,RIGHT_LOWER_CORNER);
}
void DrawLine(int no_of_columns,
         int left_char,int middle_char,int right_char)
{
  int k;
  printf("%c",left_char);
  for(k=1;k<= no_of_columns;k++)
      printf("%c%c%c%c",
    HORIZONTAL_LINE,HORIZONTAL_LINE,HORIZONTAL_LINE,middle_char);
  printf("%c%c%c%c",
       HORIZONTAL_LINE,HORIZONTAL_LINE,HORIZONTAL_LINE,right_char);
 
}