C語言 strcspn()用法及代碼示例

C庫函數strcspn()計算兩個字符串中第一次出現的字符之前的字符數長度。句法：

strcspn(const char *str1, const char *str2)

參數：
str1 :The Target string in which search has to be made.
str2 :Argument string containing characters
to match in target string.

返回值：
This function returns the number of characters before the 1st occurrence
of character present in both the string.

// C code to demonstrate the working of 
// strcspn() 
#include <stdio.h> 
#include <string.h> 
  
int main() 
{ 
  
    int size; 
  
    // initializing strings 
    char str1[] = "geeksforgeeks"; 
    char str2[] = "kfc"; 
  
    // using strcspn() to calculate initial chars 
    // before 1st matching chars. 
    // returns 3 
    size = strcspn(str1, str2); 
  
    printf("The unmatched characters before first matched character:  %d\n", size); 
}

輸出：

The unmatched characters before first matched character: 3

實際應用：該函數可以有許多實際應用，無論是文字遊戲還是不規則計算器。本文演示了一個簡單的文字遊戲。

規則：根據此遊戲，有2位玩家參加比賽，其中1位玩家最初生成了一個字符串，並被要求生成一個字符串，該字符串包含許多不匹配的字符。 1回合後，產生最多字符的字符串的玩家獲勝。

// C code to demonstrate the application of 
// strcspn() 
  
#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
  
int main() 
{ 
  
    int score1 = 0, score2 = 0, k = 0, sizen = 0, size = 0; 
  
    // initial Round1 strings 
    char player1[] = "geeks"; 
    char play2[] = ""; 
  
    while (1) { 
        // generating random character 
        char randoml = 'a' + (random() % 26); 
        play2[k++] = randoml; 
  
        size = strcspn(play2, player1); 
  
        if (size == sizen) { 
            // if the character is present, break 
            score2 = size; 
            break; 
        } 
        else { 
            sizen = size; 
        } 
    } 
  
    // initial Round2 strings 
    const char player2[] = "geeks"; 
    char play1[] = ""; 
    k = 0, sizen = 0; 
  
    while (1) { 
        // generating random character 
        char randoml = 'a' + (random() % 26); 
        play1[k++] = randoml; 
  
        size = strcspn(play1, player2); 
  
        if (size == sizen) { 
  
            // if the character is present, break 
            score1 = size; 
            break; 
        } 
        else { 
            sizen = size; 
        } 
    } 
  
    if (score1 > score2) 
        printf("Player 1 won!! Score:%d", score1); 
    else if (score2 > score1) 
        printf("Player 2 won!! Score:%d", score2); 
    else
        printf("Match Drawn!! Score:%d", score1); 
}

輸出：

Match Drawn!! Score:2

相關用法

注：本文由純淨天空篩選整理自Vaishnavi tripathi大神的英文原創作品 strcspn() in C。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。