字符串处理

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Exercise 1-12.

Write a program that prints its input one word per line.

#include <stdio.h>#define IN 1 // inside a word#define OUT 0 // outside a wordmain(){int c;int state = OUT;while((c = getchar()) != EOF){if (c == ' ' || c == '\n' || c == '\t'){if(state == IN){state = OUT;printf("\n");}} else if(state == OUT){state = IN;putchar(c);} else putchar(c);}}

1.6 Arrays

Let is write a program to count the number of occurrences of each digit, of white space characters (blank, tab, newline), and of all other characters.

#include <stdio.h>// count digits, white space, othersmain(){int c, i, nwhite, nother;int ndigit[10];nwhite = nother =0;for (i = 0; i < 10; i++)ndigit[i] = 0;while ((c = getchar()) != EOF){if (c >= '0' && c <= '9')++ndigit[c - '0'];else if (c == ' ' || c == '\n' || c == '\t')++nwhite;else ++nother;}printf("digits = ");for (i = 0; i < 10; i++)printf(" %d", ndigit[i]);printf(", white space = %d, other = %d\n", nwhite, nother);}

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