ファイルの入出力の場合

case1.c

#include <stdioh.h>
#include <stdlib.h>
 
int main()
{
 FILE *infile, *outfile;
 int L, a, b, c, d;
 int M, N;
 
 infile = fopen("in1.txt","r");
 if(infile == NULL)
     printf("\acan't open iffile\n");
     
 outfile = fopen("out1.txt","w");
 if (outfile == NULL)
     printf("\acan't open outfile\n");
 fscanf(infile,"%d\n%d\n%d\n%d\n%d\n",&L, &a, &b, &c, &d);
 
 M = a/c;
 N = b/d;
 if(a % c != 0)
     M++;
 if(b % d != 0)
     N++;
     
 if(M > N)
     fprintf(outfile,"%d\n",L - M);
 else
     fprintf(outfile,"%d\n",L - N);
     
 fclose(infile);
 fclose(outfile);
 
 return 0;
}

修正しました。