C File Management
The fprintf & fscanf functions
/*Program to handle mixed data types*/
#include <stdio.h >
main()
{
FILE *fp;
int num,qty,I;
float price,value;
char item[10],filename[10];
printf(“Input filename”);
scanf(“%s”,filename);
fp=fopen(filename,”w”);
printf(“Input inventory data\n\n”0;
printf(“Item namem number price quantity\n”);
for I=1;I< =3;I++)
{
fscanf(stdin,”%s%d%f%d”,item,&number,&price,&quality);
fprintf(fp,”%s%d%f%d”,itemnumber,price,quality);
}
fclose (fp);
fprintf(stdout,”\n\n”);
fp=fopen(filename,”r”);
printf(“Item name number price quantity value”);
for(I=1;I< =3;I++)
{
fscanf(fp,”%s%d%f%d”,item,&number,&prince,&quality);
value=price*quantity”;
fprintf(“stdout,”%s%d%f%d%d\n”,item,number,price,quantity,value);
}
fclose(fp);
}
}
The fprintf and scanf functions are identical to printf and scanf functions except that they work on files. The first argument of theses functions is a file pointer which specifies the file to be used. The general form of fprintf is fprintf(fp,”control string”, list);
Where fp is a file pointer associated with a file that has been opened for writing. The control string is file output specifications list may include variable, constant and string.
