undefined reference to `sqrt'
up vote
2
down vote
favorite
Part of my program is to calculate sqrt of float number.
When I write sqrt(1.0f); I success to compile the program,but when I write sqrt(-1.0f);
the compilation fails with undefined reference to 'sqrt' - I suppose that in this case the nan value will be returned...
I compile the program uing gcc.
When I compile it with visual studio it is compiled successfuly with negative argument to sqrt.
How the problem could be solved
Thank you
c nan sqrt
edited Jan 8 '12 at 19:42
Pascal Cuoq
66.5k6124227
asked Jan 8 '12 at 19:39
Yakov
3,4561478147
add a comment |
up vote
2
down vote
favorite
Part of my program is to calculate sqrt of float number.
When I write sqrt(1.0f); I success to compile the program,but when I write sqrt(-1.0f);
the compilation fails with undefined reference to 'sqrt' - I suppose that in this case the nan value will be returned...
I compile the program uing gcc.
When I compile it with visual studio it is compiled successfuly with negative argument to sqrt.
How the problem could be solved
Thank you
c nan sqrt
edited Jan 8 '12 at 19:42
Pascal Cuoq
66.5k6124227
asked Jan 8 '12 at 19:39
Yakov
3,4561478147
gcc myprog.c -o myprog -lm the -l to include a library m for the math library -lm.
– old_timer
Jan 8 '12 at 19:41
add a comment |
up vote
2
down vote
favorite
up vote
2
down vote
favorite
Part of my program is to calculate sqrt of float number.
When I write sqrt(1.0f); I success to compile the program,but when I write sqrt(-1.0f);
the compilation fails with undefined reference to 'sqrt' - I suppose that in this case the nan value will be returned...
I compile the program uing gcc.
When I compile it with visual studio it is compiled successfuly with negative argument to sqrt.
How the problem could be solved
Thank you
c nan sqrt
edited Jan 8 '12 at 19:42
Pascal Cuoq
66.5k6124227
asked Jan 8 '12 at 19:39
Yakov
3,4561478147
Part of my program is to calculate sqrt of float number.
When I write sqrt(1.0f); I success to compile the program,but when I write sqrt(-1.0f);
the compilation fails with undefined reference to 'sqrt' - I suppose that in this case the nan value will be returned...
I compile the program uing gcc.
When I compile it with visual studio it is compiled successfuly with negative argument to sqrt.
How the problem could be solved
Thank you
c nan sqrt
c nan sqrt
edited Jan 8 '12 at 19:42
Pascal Cuoq
66.5k6124227
asked Jan 8 '12 at 19:39
Yakov
3,4561478147
edited Jan 8 '12 at 19:42
Pascal Cuoq
66.5k6124227
asked Jan 8 '12 at 19:39
Yakov
3,4561478147
edited Jan 8 '12 at 19:42
Pascal Cuoq
66.5k6124227
edited Jan 8 '12 at 19:42
Pascal Cuoq
66.5k6124227
edited Jan 8 '12 at 19:42
Pascal Cuoq
66.5k6124227
66.5k6124227
asked Jan 8 '12 at 19:39
Yakov
3,4561478147
asked Jan 8 '12 at 19:39
Yakov
3,4561478147
asked Jan 8 '12 at 19:39
Yakov
3,4561478147
3,4561478147
gcc myprog.c -o myprog -lm the -l to include a library m for the math library -lm.
– old_timer
Jan 8 '12 at 19:41
add a comment |
gcc myprog.c -o myprog -lm the -l to include a library m for the math library -lm.
– old_timer
Jan 8 '12 at 19:41
gcc myprog.c -o myprog -lm the -l to include a library m for the math library -lm.
– old_timer
Jan 8 '12 at 19:41
gcc myprog.c -o myprog -lm the -l to include a library m for the math library -lm.
– old_timer
Jan 8 '12 at 19:41
add a comment |
2 Answers
2
active
oldest
votes
up vote
5
down vote
accepted
You have to add the -lm flag on most Unix-based systems, as in:
Compile using:
gcc -c file.c
and then link using:
gcc -o program file.o -lm
Or if you don't want to separate the two compilation steps, simply write:
gcc -o program file.c -lm
add a comment |
up vote
4
down vote
Link with -lm to link with the math library
answered Jan 8 '12 at 19:41
Manuel Selva
10.3k1863117
Can you please give a reason for it. I tried including <math.h> in headers, but then facing the error as mentioned in the question.
– Akash Chandwani
Nov 27 '16 at 18:06
add a comment |
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
5
down vote
accepted
You have to add the -lm flag on most Unix-based systems, as in:
Compile using:
gcc -c file.c
and then link using:
gcc -o program file.o -lm
Or if you don't want to separate the two compilation steps, simply write:
gcc -o program file.c -lm
add a comment |
up vote
5
down vote
accepted
You have to add the -lm flag on most Unix-based systems, as in:
Compile using:
gcc -c file.c
and then link using:
gcc -o program file.o -lm
Or if you don't want to separate the two compilation steps, simply write:
gcc -o program file.c -lm
add a comment |
up vote
5
down vote
accepted
up vote
5
down vote
accepted
You have to add the -lm flag on most Unix-based systems, as in:
Compile using:
gcc -c file.c
and then link using:
gcc -o program file.o -lm
Or if you don't want to separate the two compilation steps, simply write:
gcc -o program file.c -lm
You have to add the -lm flag on most Unix-based systems, as in:
Compile using:
gcc -c file.c
and then link using:
gcc -o program file.o -lm
Or if you don't want to separate the two compilation steps, simply write:
gcc -o program file.c -lm
answered Jan 8 '12 at 19:44
user529758
add a comment |
add a comment |
up vote
4
down vote
Link with -lm to link with the math library
answered Jan 8 '12 at 19:41
Manuel Selva
10.3k1863117
Can you please give a reason for it. I tried including <math.h> in headers, but then facing the error as mentioned in the question.
– Akash Chandwani
Nov 27 '16 at 18:06
add a comment |
up vote
4
down vote
Link with -lm to link with the math library
answered Jan 8 '12 at 19:41
Manuel Selva
10.3k1863117
Can you please give a reason for it. I tried including <math.h> in headers, but then facing the error as mentioned in the question.
– Akash Chandwani
Nov 27 '16 at 18:06
add a comment |
up vote
4
down vote
up vote
4
down vote
Link with -lm to link with the math library
answered Jan 8 '12 at 19:41
Manuel Selva
10.3k1863117
Link with -lm to link with the math library
answered Jan 8 '12 at 19:41
Manuel Selva
10.3k1863117
answered Jan 8 '12 at 19:41
Manuel Selva
10.3k1863117
answered Jan 8 '12 at 19:41
Manuel Selva
10.3k1863117
answered Jan 8 '12 at 19:41
Manuel Selva
10.3k1863117
10.3k1863117
Can you please give a reason for it. I tried including <math.h> in headers, but then facing the error as mentioned in the question.
– Akash Chandwani
Nov 27 '16 at 18:06
add a comment |
Can you please give a reason for it. I tried including <math.h> in headers, but then facing the error as mentioned in the question.
– Akash Chandwani
Nov 27 '16 at 18:06
Can you please give a reason for it. I tried including <math.h> in headers, but then facing the error as mentioned in the question.
– Akash Chandwani
Nov 27 '16 at 18:06
Can you please give a reason for it. I tried including <math.h> in headers, but then facing the error as mentioned in the question.
– Akash Chandwani
Nov 27 '16 at 18:06
add a comment |
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gcc myprog.c -o myprog -lm the -l to include a library m for the math library -lm.
– old_timer
Jan 8 '12 at 19:41