在字符串中输入字符，直到下一个为整数-C

Question

I'm trying to find the best way to get this kind of input: "Word1 word2 1 2 3 4 -1" Basically I want to save "This is a string" in a string and add the numbers to a variable sum until they reach -1.

I've tried with

scanf("%s %s", &string1, &string2);

It doesn't work properly.

Answer 1

#include <stdio.h>

int main(void)
{
  char line[4096];
  while (fgets(line, sizeof(line), stdin) != 0)
  {
    char name1[32];
    char name2[32];
    int score = 0;
    int offset = 0;
    int length = 0;
    int number;
    if (sscanf(line + length, "%s%n", name1, &offset) != 1)
        break;
    length += offset;
    if (sscanf(line + length, "%s%n", name2, &offset) != 1)
        break;
    length += offset;
    while (sscanf(line + length, "%d%n", &number, &offset) == 1 && number != -1)
    {
      length += offset;
      score += number;
    }
    printf("%s %s %d\n", name1, name2, score);
  }
  return 0;
}

Data file:

John Smith 1 2 4 5
John Sutton 2 4 6 8 9 -1
Maggie Smith 9 8 9 8 9 9 -1

Sample output:

John Smith 12
John Sutton 29
Maggie Smith 52

You can fix it to object if there isn't a -1 at the end (though it really isn't needed, witness the first line of input), and similarly you can object if there are more than 6 entries, etc.

Or, if you want to use fscanf() , then you can do this (which gives the same output for the given input as the original version):

#include <stdio.h>

int main(void)
{
  char name1[32];
  char name2[32];
  int score[7];
  int nv;
  while ((nv = fscanf(stdin, "%31s %31s %d %d %d %d %d %d %d",
                name1, name2, &score[0], &score[1], &score[2], &score[3],
                &score[4], &score[5], &score[6])) > 2)
  {
    int total = 0;
    for (int i = 0; i < nv - 2; i++)
    {
        if (score[i] == -1)
          break;
        total += score[i];
    }
    printf("%s %s %d\n", name1, name2, total);
  }
  return 0;
}

Note that this code knows how many numbers were successfully read ( nv - 2 ), and proceeds accordingly. Now your task is to go messing with the data file to see what other formats it accepts, and then decide whether this is better. You can also use a hybrid program, using fgets() to read a line and a sscanf() analogous to the fscanf() in the second program to read all the values at once.