Program using ceil()

Question

I did the following code using ceil()

#include<stdio.h>
#include<math.h>    
int main()
{
  float val;
  float cVal;

  val=23.4;

  cVal =ceil(val);
  printf("ceil value:%f\n",cVal);
  return 0;
}

I am getting th following error In function main': test1.c:(.text+0x1b): undefined reference toceil' collect2: error: ld returned 1 exit status

What is wrong in this code??Please help!

I asked this code before but then I did not specify how I compiled this program. A person suggested to include -lm while compiling when using gcc. But,

I compiled it using makefile

>>cmake .
>>make
>>./hello.out

score 1 · Answer 1 · answered Mar 04 '20 at 12:07

1

You need to link your executable with the math library.

For example:

gcc hello.c -o hello -lm

answered Mar 04 '20 at 12:07

s7amuser

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score 1 · Answer 2 · answered Mar 04 '20 at 12:08

1

Most mathematical functions live in their own library that needs to be linked with the main program. This library is aptly called m.

So you need to add a target_link_libraries to your CMakeLists.txt file to include the m library.

answered Mar 04 '20 at 12:08

Some programmer dude

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Program using ceil()

2 Answers2