Thread: Counting occurrences of a word in a string

I'm trying to write a program that will take in several lines of text and then take in a target word to look for in the lines of text. I need to return how many times the target word appears in the lines of text. I have everything but the function to find the number of occurrences of the target word. I've been working on it for a while and can't find a way to do it.

Code:

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

int analyzeLine(char text[], char target[]);
// Function for analyzing lines of text

int main(void)
{
    int i = 0;            // Variable for progressing through a for loop
    int lines;            // Number of lines to be analyzed
    int occurrences = 0;
    int sum = 0;
    char repeat = 'y';    // Used to prompt if the program should be repeated
    char text[81];        // String for lines of text
    char target[100];
    
    while(repeat == 'y')
    {
       printf("Please enter the target word: ");
       fgets(target, sizeof(target), stdin);
       printf("Please enter the number of lines to be analyzed: ");
       scanf("%d", &lines);
       fflush(stdin);
       
       // Input and analyzation of the lines of text
       
       for(i=0; i<lines; i++)
       {
          printf("\n\nLine #%d:\n", i+1);
          fgets(text, sizeof(text), stdin);
          sum = analyzeLine(text, target);
          occurrences += sum;
       }
       
       printf("\n\n");
       
       // Printing the number of occurrences to the screen
       
       printf("The target occurs %d times\n", occurrences);
       
       // Prompt for repeating of program
       
       printf("\nWould you like to analyze more lines?");
       printf("\nEnter Y for yes or N for no: ");
       scanf(" %c", &repeat);
       repeat = tolower(repeat);
       fflush(stdin);
    }
    
    system("pause");
    return 0;
}

int analyzeLine(char text[], char target[])
{

Check strstr() function from string.h.

Or, you could write your own function - simply iterate the line from begining to end - store each word in a temp array, when you get to first isspace() char check if the word matches the one you're looking for. If so, increment the counter, otherwise continue searching the line.

Something like this.

Code:

int analyzeLine(char text[], char target[])
{
    char *p;
    char temp[100];
    char *t = temp;
    int state, in = 1, out = 0;
    int occurence = 0;
    
    state = out;
    for(p = text; *p; p++) {
          if(isspace(*p)) {
             if(state == in) {
                 *t = '\0';
                 t = temp;
                 if(strcmp(temp, target) == 0)
                    occurence++;
             }
             state = out;
          } else {
             *t++ = *p;
             state = in;
          }
    }
    *t = '\0';
    if(strcmp(temp, target) == 0)
       occurence++;
    return occurence;
}

RTM on regcomp() and regexec() especially the section about rm_so and rm_eo.
The word becomes the pattern you're looking for ie the 2nd arg to regcomp().
Create a variable of type regmatch_t which becomes the 4th arg to regexec().
Call regexec() and if there's a match (returns zero), increment a found counter.