/*
\\次のような家計簿データkakeibo.datがテキストでかかれてあり、中身を見ると
\\meat 125 1
\\rice 2000 1
\\juice 110 10
\\となっているものとする。このうち右端は商品名、真ん中は単価、左端は数量を表して
\\いる。このようなデータを読み取って使用金額の合計を計算するプログラミングを作り
\\たい。以下のプログラムをコンパイルがとおり、目的の動作をするように直接書き込み
\\なさい。（どこを補うべきかも考えること）ただし商品名は空欄を含まない文字列とする。
*/
 
#include<stdio.h>
#include<stdlib.h>
 
#define FILENAME "kakeibo.dat"
 
int goukei(FILE *fp);
 
 
int main(){
   FILE *fp;
 
   fp = fopen(FILENAME,"r");
   if(fp==NULL){
      fprintf(stderr,"%s is not found!\n",FILENAME);
      exit(1);
   }
 
   printf("goukei = %d\n",goukei(fp));
   fclose(fp);
   return 0;
}
 
int goukei(FILE *fp){
    int sum =0, tanka, suryou;
    char str[50];
    while (fscanf("%s %d %d", str, &tanka, &suryou)!=EOF){
        sum += tanka * suryou;
    }
    return  sum;
}
 

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