Parsing strings (C) (1) Prompt the user for a string that contains two strings s
ID: 3888788 • Letter: P
Question
Parsing strings (C)
(1) Prompt the user for a string that contains two strings separated by a comma. (1 pt)
Examples of strings that can be accepted:
Jill, Allen
Jill , Allen
Jill,Allen
Ex:
(2) Report an error if the input string does not contain a comma. Continue to prompt until a valid string is entered. Note: If the input contains a comma, then assume that the input also contains two strings. (2 pts)
Ex:
(3) Extract the two words from the input string and remove any spaces. Store the strings in two separate variables and output the strings. (2 pts)
Ex:
(4) Using a loop, extend the program to handle multiple lines of input. Continue until the user enters q to quit. (2 pts)
Explanation / Answer
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define BUFFER_SIZE 1000
void trim(char *str) {
int i, begin = 0;
int end = strlen(str) - 1;
while (isspace((unsigned char) str[begin])) {
begin++;
}
while ((end >= begin) && isspace((unsigned char) str[end])) {
end--;
}
for (i = begin; i <= end; i++) {
str[i - begin] = str[i];
}
str[i - begin] = '';
}
int main() {
char input[BUFFER_SIZE];
int i =0;
while (1) {
printf("Enter input string : ");
fgets(input, BUFSIZ, stdin);
if (strcmp(input, "q ") == 0) {
break;
}
for (i=0; i<strlen(input); i++) {
if (input[i] == ',') {
char *first_word, *second_word;
char *search = ",";
first_word = strtok(input,search);
second_word = strtok(NULL,search);
trim(first_word);
trim(second_word);
printf("First Word : %s ", first_word);
printf("Second Word : %s ", second_word);
exit(0);
}
}
printf("Error: No comma in string. ");
}
}