字符串

 1 #include <stdio.h>
 2 
 3 void concat(char result[], const char str1[], int n1, 
 4             const char str2[], int n2) 
 5 {
 6     int i, j;
 7     // put str1 and str2 in result in sequence
 8     for (i=0; i<n1; i++)
 9         result[i] = str1[i];
10     for (j=0; j<n1; j++)
11         result[i+j] = str2[j];
12 }
13 
14 int main(void)
15 {
16     
17     void concat(char result[], const char str1[], int n1, 
18             const char str2[], int n2);
19     char str1[6] = {‘H‘,‘e‘,‘l‘,‘l‘,‘o‘,‘,‘};
20     char str2[6] = {‘w‘,‘o‘,‘r‘,‘l‘,‘d‘,‘!‘};
21     char result[12];
22     concat(result, str1, 6, str2, 6); 
23     int i;

  1 #include <stdio.h>
  2 
  3 int len(char string[])
  4 {
  5     // get the length of a string which ends with a ‘\0‘
  6     int length=0;
  7     while (string[length] != ‘\0‘)
  8        length++;
  9     return length;
 10  }
 11 
 12 
 13 int main(void)
 14 {
 15 
 16     int len(char string[]);
 17     char name[] = {‘A‘,‘b‘,‘r‘,‘a‘,‘h‘,‘a‘,‘m‘,‘\0‘};
 18     printf("%i\n", len(name));
 19     return 0;
 20 }