C/Console/Printf

Demonstrates printing the results of simple equations

<source lang="cpp">

1. include <stdio.h>

int main() {

   int term = 3 * 5;
   printf("Twice %d is %d\n", term, 2*term);
   printf("Three times %d is %d\n", term, 3*term);
   return (0);

}

      </source>

Displaying printable characters

<source lang="cpp">

1. include <stdio.h>
2. include <ctype.h>

void main() {

 int i = 0;  /* Loop counter         */
 
 char ch = 0;
 
 for(i = 0 ; i<128 ; i++) {
   ch = (char)i;
   if( ch % 2 == 0)
     printf("\n");
   printf("  %4d    %c",ch,(isgraph(ch) ? ch : " "));
 }
 printf("\n");

}

      </source>

Displaying printable characters plus whitspace names

<source lang="cpp">

1. include <stdio.h>
2. include <ctype.h>

void main() {

 int i = 0;                         /* Loop counter         */
 char ch = 0;                       /* Character code value */
 for(i = 0 ; i<128 ; i++)
 {
   ch = (char)i;
   if(ch%2==0)
     printf("\n");
   printf("  %4d",ch);
   if(isgraph(ch))
     printf("               %c",ch);
   else
     switch(ch)
   {
       case "\n":
          printf("         newline",ch);
          break;
       case " ":
          printf("           space",ch);
          break;
       case "\t":
          printf("  horizontal tab",ch);
          break;
       case "\v":
          printf("    vertical tab",ch);
          break;
        case "\f":
          printf("       form feed",ch);
          break;
       default:
          printf("                ");
          break;
   }
 }
 printf("\n");

}

      </source>

printf usage

<source lang="cpp">

1. include <stdio.h>

int main() {

   printf("Hello World\n");
   return (0);

}

      </source>

Prints 3 characters forward and backward to demonstrate character printing

<source lang="cpp">

1. include <stdio.h>

int main() {

   char char1;     /* first character */
   char char2;     /* second character */
   char char3;     /* third character */
   char1 = "A";
   char2 = "B";
   char3 = "C";
   printf("%c%c%c reversed is %c%c%c\n",
       char1, char2, char3,
       char3, char2, char1);
   return (0);

}

      </source>

Return value from printf

<source lang="cpp">

1. include <stdio.h>

main() {

    int i = 0;
    
    i=printf("abcde"); 
    
    printf("total characters printed %d\n",i); 

}

      </source>