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How can I use a c function to determine what a string ends in?
The program is supposed to use the hydroxide function to check an inputted string to see if it ends in oh (or ho) and return a 1 value if it does. Here is what I have written and when I run the program it just freezes. I am still a beginner so I apologize in advance if this is a stupid question.
#include <stdio.h>
#include <string.h>
#define MAX_LEN 10
int hydroxide(char *compound);
int
main(void)
{
char compound[MAX_LEN];
int i, num;
printf("Enter compound> \n");
scanf("%s", compound);
for (i = 0; i < strlen(compound); ++i) {
if (islower(compound[i]))
compound[i] = toupper(compound[i]);
}
num = hydroxide(compound);
printf("%d", num);
return(0);
}
int hydroxide(char *compound)
{
char *end[4], *temp;
int last, status;
last = strlen(compound);
strcpy(end[], &compound[last - 2]);
if (strcmp(end[last - 2],end[last - 1]) > 0) {
temp = end[last - 2];
end[last - 2] = end[last - 1];
end[last - 1] = temp;
}
if (*end[last - 2] == 'H') {
if (*end[last - 1] == 'O')
status = 1;
}
return(status);
}
Algorithms
Last Comment
phoffric
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Here is a suggestion. Write a function called isOHorHOatEndOfString, which takes in the string and uses the following library function, strrchr - "Locate last occurrence of character in string"
http://www.cplusplus.com/reference/cstring/strrchr/
Notice that the return values is "A pointer to the last occurrence of character in str".
Here is a suggestion. Write a function called isOHorHOatEndOfString, which takes in the string and uses the following library function, strrchr - "Locate last occurrence of character in string"
http://www.cplusplus.com/reference/cstring/strrchr/
Notice that the return values is "A pointer to the last occurrence of character in str".
strcpy(end[], &compound[last - 2]);
intended to do?