12

Iterate in a table

Count the letters in a document  |  Sum of the elements of a table

table.c
  1. #include <stdlib.h>
  2. #include <stdio.h>
  3.  
  4. #define TABSIZE 4
  5.  
  6. main() {
  7.     float tab[ TABSIZE ];
  8.     float *pf;
  9.     int i;
  10.  
  11.  
  12.     printf("Enter 4 reals: \n");
  13.  
  14.     i = 0;
  15.     while ( i < TABSIZE ) {
  16.         printf("%d: ", i+1);
  17.         switch( scanf("%f", &tab[i])) {
  18.             case 0:
  19.                 exit(1);
  20.             case 1:
  21.                 ++i;
  22.                 break;
  23.             default:
  24.                 scanf("%*s");   /* swallow */
  25.                 break;
  26.         }
  27.     }
  28.  
  29.     printf("You have entered (in reverse order): \n");
  30.  
  31.     /* iteration with an index */
  32.     for ( i = TABSIZE-1; i >= 0; i-- )
  33.         printf("%d: %f\n", i+1, tab[ i ]);
  34.  
  35.     printf("Here are their addresses in memory: \n");
  36.  
  37.     /* iteration with a pointer */
  38.     for ( pf = tab; pf < tab+TABSIZE; pf++ )
  39.         printf("%f\t-> 0x%x\n", *pf, (unsigned)pf);
  40.  
  41.     exit(0);
  42. }

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