有太多的错误让人记不住了,只是一行一行地去做,但这里有一些开始
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在所有要重写变量的if语句中,使用
==
而不是
=
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计数器没有执行任何操作,请使用scanf和%n查找读取的字符数
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您不希望将计数器变量作为中间参数传递给回文函数,因为输入字符串中的尾随“\0”。。。而是使用counter1
可能还有其他版本,但这里是原始代码的最低工作版本:
#include <stdio.h>
#include <stdlib.h>
/*Delare the prototypes*/
char palindromes(char[], int, int);
char backwards(char[], int, int);
int main ()
{
char userinput[10];/*Declares the character array for the input*/
int palindex= 0;/*Declares the index to check for a palindrome*/
int index= 0;/*Index for the counting loop*/
int counter= 0;/*Counts number of elements entered in the array*/
int palcheck= 1;/*Sets a value for the palindrome checking loop, for verification*/
int charswap= 0;/*Sets an index for the loop that swaps the values*/
int printindex= 0;/*Index to print the values on the screen*/
printf("Please enter a series of nine or less characters to test for a palindrome.\n");
scanf(" %9s%n", &userinput, &counter);
printf("\n");
for(palindex; palindex < (counter/2); palindex++)
{
palcheck = palindromes(userinput, counter-1, palindex);
if(palcheck == 0)
break;
}/*End of palidrome verification loop*/
if(palcheck == 0)
{
printf("Your input was not a palindrome \n");
}/*End of if statement*/
else
{
printf("Your input was a palindrome \n");
}/*End of else statement*/
for(palindex; palindex < (counter/2); palindex++)
{
backwards(userinput, counter, palindex);
}/*End of reversing the array loop*/
printf("Your input backwards is: ");
for(printindex; printindex < counter; printindex++)
{
printf("%c", userinput[printindex]);
}/*End of printing backwards loop*/
printf("\n");
}/*End of main function*/
char palindromes(char userinput[], int counter, int palindex)
{
char firstchar;/*Temp variable for the two items to be tested*/
char lastchar;/*Temp variable for the two iteams to be tested*/
firstchar = userinput[palindex];
lastchar = userinput[counter - palindex];
if(firstchar == lastchar)
{
return 1;
}
else
{
return 0;
}
}/*End of palidrome function*/
char backwards(char userinput[], int counter, int palindex)
{
char temp;/*Sets a temporary value to swap the two values*/
temp = userinput[palindex];
userinput[palindex] = userinput[counter-palindex];
userinput[counter-palindex] = temp;
}/*End of reverse function*/
