C Programming - Floating Point Issues - Discussion
Discussion Forum : Floating Point Issues - Point Out Errors (Q.No. 1)
1.
Point out the error in the following program.
#include<stdio.h>
int main()
{
struct emp
{
char name[20];
float sal;
};
struct emp e[10];
int i;
for(i=0; i<=9; i++)
scanf("%s %f", e[i].name, &e[i].sal);
return 0;
}
Answer: Option
Explanation:
Compile and Run the above program in Turbo C:
C:\>myprogram.exe Sundar 2555.50 scanf : floating point formats not linked Abnormal program termination
The program terminates abnormally at the time of entering the float value for e[i].sal.
Solution:
Just add the following function in your program. It will force the compiler to include required libraries for handling floating point linkages.
static void force_fpf() /* A dummy function */
{
float x, *y; /* Just declares two variables */
y = &x; /* Forces linkage of FP formats */
x = *y; /* Suppress warning message about x */
}
Discussion:
36 comments Page 4 of 4.
Kirti said:
1 decade ago
What is emulator? What it does?
Pessi said:
1 decade ago
Ok if scanf cannot be used in structures then it would give an error related to it but given a linking error right? what does it mean?
Vikas tyagi said:
1 decade ago
/* Usage of an array of structures */
#include<stdio.h>
void main( )
{
struct book
{
char name[10] ;
float price ;
int pages ;
} ;
struct book b[100] ;
int i ;
float temp;
for ( i = 0 ; i <=99; i++ )
{
printf ( "\nEnter name, price and pages " ) ;
scanf ( "%s %f %d", &b[i].name, &temp, &b[i].pages ) ;
b[i].price=temp;
}
for ( i = 0 ; i <= 99 ; i++ )
printf ( "\n%s %f %d", b[i].name, b[i].price, b[i].pages ) ;
getch();
}
#include<stdio.h>
void main( )
{
struct book
{
char name[10] ;
float price ;
int pages ;
} ;
struct book b[100] ;
int i ;
float temp;
for ( i = 0 ; i <=99; i++ )
{
printf ( "\nEnter name, price and pages " ) ;
scanf ( "%s %f %d", &b[i].name, &temp, &b[i].pages ) ;
b[i].price=temp;
}
for ( i = 0 ; i <= 99 ; i++ )
printf ( "\n%s %f %d", b[i].name, b[i].price, b[i].pages ) ;
getch();
}
Sudip said:
1 decade ago
#include<stdio.h>
#include<conio.h>
static void force_dpf() /* A dummy function */
{
float x, *y; /* Just declares two variables */
y = &x; /* Forces linkage of FP formats */
x = *y; /* Suppress warning message about x */
}
int main()
{
struct emp
{
char name[20];
float sal;
};
struct emp e[10];
int i;
force_dpf();
for(i=0; i<=2; i++)
scanf("%s %f", e[i].name, &e[i].sal);
for(i=0; i<=2; i++)
printf("\n%s %f", e[i].name, e[i].sal);
getch();
}
#include<conio.h>
static void force_dpf() /* A dummy function */
{
float x, *y; /* Just declares two variables */
y = &x; /* Forces linkage of FP formats */
x = *y; /* Suppress warning message about x */
}
int main()
{
struct emp
{
char name[20];
float sal;
};
struct emp e[10];
int i;
force_dpf();
for(i=0; i<=2; i++)
scanf("%s %f", e[i].name, &e[i].sal);
for(i=0; i<=2; i++)
printf("\n%s %f", e[i].name, e[i].sal);
getch();
}
Amit chopra said:
1 decade ago
This program is working, not even giving warnings on gcc compiler. I didn't understand whts the issue here. Please elaborate with respect to gcc?
Pathmaraj said:
1 decade ago
I don't know how that function include libraries without calling main(). Can you please explain this concept elaborately?
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