C 语言程序:替换字符串中某个字符的最后一次出现

编写一个 C 语言程序,用示例替换字符串中某个字符的最后一次出现。

C 语言程序:替换字符串中某个字符的最后一次出现 示例 1

此 C 程序允许用户输入一个字符串(或字符数组)和一个字符值。接下来,它将查找并替换字符串中该字符的最后一次出现。

/* C Program to Replace Last Occurrence of a Character in a String */
 
#include <stdio.h>
#include <string.h>
 
int main()
{
  	char str[100], ch, Newch;
  	int i, index;
  	index = -1;
 
  	printf("\n Please Enter any String :  ");
  	gets(str);
  	
  	printf("\n Please Enter the Character that you want to Replace :  ");
  	scanf("%c", &ch);
  	
  	getchar();
  	
  	printf("\n Please Enter the New Character :  ");
  	scanf("%c", &Newch);
  	
  	for(i = 0; str[i] != '\0'; i++)
  	{
  		if(str[i] == ch)  
		{
  			index = i;
 		}
	}
	
	if(index != -1)
  	{
  		str[index] = Newch;
	}

	printf("\n The Final String after Replacing Last occurrence of '%c' with '%c' = %s ", ch, Newch, str);
	
  	return 0;
}
C Program to Replace Last Occurrence of a Character in a String 1

首先,我们使用 For 循环 迭代 C 语言 C Programming 字符串中的每个字符。

for(i = 0; i <= strlen(str); i++)
{
	if(str[i] == ch)  
	{
		index = i;  	
	}
}

接下来,我们使用 If 语句 来检查索引值是否不等于 -1。如果为 True,则执行 str[index] = Newch;
str[] = Hello
ch = l
Newch = @
Index = -1

For 循环第一次迭代:for(i = 0; i <= strlen(str); i++)
条件为 True,因为 i <= 5。

在 While 循环中,我们使用 If 语句 来检查 str[0] 是否等于用户指定的字符。

if(str[i] == ch) => if(H == l) – 条件为 False。因此,i 值将被递增,Index 值仍为 -1。

第二次迭代:for(i = 1; 1 <= 5; 1++)
if(str[i] == ch) => if(e == l) – 条件为 False。因此,i 将被递增,Index 值仍为 -1。

第三次迭代:for(i = 2; 2 <= 5; 2++)
if(str[i] == ch) => if(l == l) – 条件为 True
Index = i
index = 2

第三次迭代:for(i = 3; 3 <= 5; 3++)
if(str[i] == ch) => if(l == l) – 条件为 True
index = i = 3

对剩余的迭代执行相同的操作。

接下来,我们使用 If 语句 来检查索引值是否等于 -1。这里,条件为 True,所以,
str[index] =Newch
str[3] = @

最后,我们使用 printf 语句打印最终的 字符串

printf("\n The Last Occurrence of the Search Element '%c' is at Position %d ", ch, i + 1);

C 语言程序:替换字符串中某个字符的最后一次出现 示例 2

这个 程序 用于替换最后一个字符的出现,与上面相同。这里,我们只是将 For 循环替换为 While 循环

/* C Program to Replace Last Occurrence of a Character in a String */

#include <stdio.h>
#include <string.h> 

int main()
{
  	char str[100], ch, Newch;
  	int i, index;
  	index = -1;
  	i = 0;
 
  	printf("\n Please Enter any String :  ");
  	gets(str);
  	
  	printf("\n Please Enter the Character that you want to Replace :  ");
  	scanf("%c", &ch);  	
  	getchar();
  	
  	printf("\n Please Enter the New Character :  ");
  	scanf("%c", &Newch);
  	
  	while(i <= strlen(str))
  	{
  		if(str[i] == ch)  
		{
  			index = i;
 		}
 		i++;
	}
	
	if(index != -1)
  	{
  		str[index] = Newch;
	}

	printf("\n The Final String after Replacing Last occurrence of '%c' with '%c' = %s ", ch, Newch, str);
	
  	return 0;
}
 Please Enter any String :  tutorial gateway

 Please Enter the Character that you want to Replace :  t

 Please Enter the New Character :  #

 The Final String after Replacing Last occurrence of 't' with '#' = tutorial ga#eway

C 语言程序:替换字符串中某个字符的最后一次出现 示例 3

这个 程序 用于替换最后一个字符的出现,与第一个示例相同。不过这次,我们应用了 函数 的概念来分离逻辑。

/* C Program to Replace Last Occurrence of a Character in a String */
 
#include <stdio.h>
#include <string.h>

void Replace_LastOccurrence(char *str, char ch, char Newch);
 
int main()
{
  	char str[100], ch, Newch;
  	int i, index;
  	index = -1;
 
  	printf("\n Please Enter any String :  ");
  	gets(str);
  	
  	printf("\n Please Enter the Character that you want to Replace :  ");
  	scanf("%c", &ch);
  	
  	getchar();
  	
  	printf("\n Please Enter the New Character :  ");
  	scanf("%c", &Newch);
  	
  	Replace_LastOccurrence(str, ch, Newch);

	printf("\n The Final String after Replacing Last occurrence of '%c' with '%c' = %s ", ch, Newch, str);
	
  	return 0;
}

void Replace_LastOccurrence(char *str, char ch, char Newch)
{
	int i, index;
  	index = -1;

	for(i = 0; str[i] != '\0'; i++)
	{
		if(str[i] == ch)
		{
			index = i;
		}  
	}
	
	if(index != -1)
  	{
  		str[index] = Newch;
	}
}
 Please Enter any String :  c programming

 Please Enter the Character that you want to Replace :  m

 Please Enter the New Character :  $

 The Final String after Replacing Last occurrence of 'm' with '$' = c program$ing