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 1 of 4.
Rahul said:
8 years ago
#include<stdio.h>
typedef struct
{
int roll;
char name[10];
float avg;
}student;
void linkfloat() // THIS FUNCTION IS USED TO LINK THE FLOATING POINT MEMBER
{
float a = 0, *b;
b = &a;
a = *b;
}
void main(void)
{
student *s;
clrscr();
printf("\n\tEnter roll : ");
scanf("%d", &s->roll);
fflush(stdin);
printf("\n\tEnter name : ");
gets(s->name);
fflush(stdin);
printf("\n\tEnter avg : ");
scanf("%f", &s->avg);
fflush(stdin);
printf("\n\tRoll : %d", s->roll);
printf("\n\tName : %s", s->name);
printf("\n\tAvg : %f", s->avg);
getch();
}
A special function called link float ( ) should be enclosed within the scope of the program. This function will get executed automatically to link the floating point member at runtime.
typedef struct
{
int roll;
char name[10];
float avg;
}student;
void linkfloat() // THIS FUNCTION IS USED TO LINK THE FLOATING POINT MEMBER
{
float a = 0, *b;
b = &a;
a = *b;
}
void main(void)
{
student *s;
clrscr();
printf("\n\tEnter roll : ");
scanf("%d", &s->roll);
fflush(stdin);
printf("\n\tEnter name : ");
gets(s->name);
fflush(stdin);
printf("\n\tEnter avg : ");
scanf("%f", &s->avg);
fflush(stdin);
printf("\n\tRoll : %d", s->roll);
printf("\n\tName : %s", s->name);
printf("\n\tAvg : %f", s->avg);
getch();
}
A special function called link float ( ) should be enclosed within the scope of the program. This function will get executed automatically to link the floating point member at runtime.
(1)
VALPLO said:
1 decade ago
It compiles excellent in GCC, at least. I suppose, the most modern compilers will be just as glad to compile this, So the question is a bit obsolete.
Gaja said:
1 decade ago
I don't understand about dummy variables &functions.
Santa said:
1 decade ago
In case of e[i].name it is not showing any error then why in the case of &e[i].sal it is shown the error ?
Ankit said:
1 decade ago
Please help me. Is it because of & not there before e[i].
JjB said:
1 decade ago
e[i].name refers to the address so no need of &.
Pramod mohite said:
1 decade ago
Why the problem use the float value use in structure?
Madhu said:
1 decade ago
Since there no addressing pointer like '&' in scanf. It generates an error.
Kunal said:
1 decade ago
No sir in gcc you can also link the float variable.
main(){
struct emp{
float k;
};
struct emp e;
printf("enter multiple vallues");
scanf("%f",&e.k);
printf("%f",e.k);
}
Try it in gcc.
main(){
struct emp{
float k;
};
struct emp e;
printf("enter multiple vallues");
scanf("%f",&e.k);
printf("%f",e.k);
}
Try it in gcc.
Kunal said:
1 decade ago
main()
{
struct emp
{
char name[25];
int age;
float sal;
};
struct emp e[2];
int i=0;
for(i=0;i<2;i++){
scanf("%s %d %f", &e[i].name, &e[i].age, &e[i].sal);
}
for(i=0;i<2;i++){
printf("%s %d %f", e[i].name, e[i].age, e[i].sal);
}
}
Try it also. It also work then what is the problem?
{
struct emp
{
char name[25];
int age;
float sal;
};
struct emp e[2];
int i=0;
for(i=0;i<2;i++){
scanf("%s %d %f", &e[i].name, &e[i].age, &e[i].sal);
}
for(i=0;i<2;i++){
printf("%s %d %f", e[i].name, e[i].age, e[i].sal);
}
}
Try it also. It also work then what is the problem?
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