[Solved] Complex algorithm to extract numbers/number range from a string

by


You’re issue seems to be misunderstanding how strtok works. Have a look at this.

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

int main()
{
        int i, j;
        char delims[] = " ,";
        char str[] = "1-5,6,7";
        char *tok;
        char tmp[256];
        int rstart, rend;

        tok = strtok(str, delims);

        while(tok != NULL) {
                for(i = 0; i < strlen(tok); ++i) {
                        //// range
                        if(i != 0 && tok[i] == '-') {
                                strncpy(tmp, tok, i); 
                                rstart = atoi(tmp);
                                strcpy(tmp, tok + i + 1); 
                                rend = atoi(tmp);
                                for(j = rstart; j <= rend; ++j)
                                        printf("%d\n", j); 
                                i = strlen(tok) + 1;
                        }   
                        else if(strchr(tok, '-') == NULL)
                                printf("%s\n", tok);
                }   

                tok = strtok(NULL, delims);
        }   

        return 0;
}

3

solved Complex algorithm to extract numbers/number range from a string