CSC373/406: Integers: Characters are just bits! [7/9]

file:ascii-table.c [source]

00001: #include <stdio.h> 00002: 00003: int main() 00004: { 00005: int i; 00006: 00007: for (i = 0; i < 128; i++) 00008: printf("%c: %d\n", i, i); 00009: } 00010:

• The example shows that characters are just numbers.
  • After all, everything on a computer is just a bunch of 0's and 1's
• Each character is represented by its ascii encoding (a number between 0 and 255)
• Printing a number using %c tells printf to treat it like a character

file:ascii-count.c [source]

00001: #include <stdio.h> 00002: 00003: main() /* counts digits, white space, others */ 00004: { 00005: int c, i, num_digits[10], num_white, num_other; 00006: 00007: num_white = num_other = 0; 00008: 00009: for(i = 0; i < 10; i++) /* initialize */ 00010: num_digits[i] = 0; 00011: 00012: while((c = getchar()) != EOF) { 00013: if (c >= '0' && c <= '9') 00014: ++num_digits[c-'0']; 00015: else if (c == ' ' || c == '\n' || c == '\t') 00016: ++num_white; 00017: else 00018: ++num_other; 00019: } 00020: 00021: printf("digits ="); 00022: for(i = 0; i < 10; i++) 00023: printf(" %d", num_digits[i]); 00024: printf(", white space = %d, other = %d\n", num_white, num_other); 00025: } 00026: