testing C inline

/*
testing C inline
-std=c99 -Wall -Wextra -Wpedantic -Wshadow -O3
*/

//main.c
//---------

#include <stdio.h>
#include <stdlib.h>
#include "dar1.h"
#include "dar2.h"

int main (int argc, char **argv)
{

    float fV = 0.0f;
    int iCount = 0;

    printf("Enter float number: ");
    iCount = scanf("%f", &fV);

    if(iCount!=1||iCount==EOF)
    {
        printf("error occurred\n");
        return 1;
    }

    printf("Test 1: %f\n",testas1(1.0f,fV));

    printf("Test 2: %f\n",testas2(1.0f,fV));

return 0;
}

//drc.h
//---------

#ifndef DRC_H
#define DRC_H

inline float tstPlus(float a)
{
    return a+1.0f;
}

#endif

dar1.c
----------

#include <stdio.h>
#include <stdlib.h>

#include "dar1.h"
#include "drc.h"

inline float tstPlus(float);

float testas1(float a,float b)
{
    b = tstPlus(b);
    return a+b;
}

//dar2.c
//----------

#include <stdio.h>
#include <stdlib.h>

#include "dar2.h"
#include "drc.h"

inline float tstPlus(float);

float testas2(float a,float b)
{
    b = tstPlus(b);
    return a-b;
}

//dar1.h
//----------

#ifndef DAR1_H
#define DAR1_H

float testas1(float,float);

#endif

//dar2.h
//----------

#ifndef DAR2_H
#define DAR2_H

float testas2(float, float);

#endif

//drc.h without inline
//=====================

#ifndef DRC_H
#define DRC_H

float tstPlus(float a);

#endif

//drc.c without inline
//=====================

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#include "drc.h"

float tstPlus(float a)
{
    return a+1.0f;
}

//dar1.c without inline
//======================

#include <stdio.h>
#include <stdlib.h>

#include "dar1.h"
#include "drc.h"

float testas1(float a,float b)
{
    b = tstPlus(b);
    return a+b;
}

/*
 *───────────────────*
*  asm without inline *
 *───────────────────*

sym.testas1 ();
    sub rsp, 0x18
    movss dword [local_ch], xmm0
    movaps xmm0, xmm1
    call sym.tstPlus
    addss xmm0, dword [local_ch]
    add rsp, 0x18
    ret

sym.testas2 ();
    sub rsp, 0x18
    movss dword [local_ch], xmm0
    movaps xmm0, xmm1
    call sym.tstPlus
    movss xmm2, dword [local_ch] ; [0xc:4]=0
    add rsp, 0x18
    subss xmm2, xmm0
    movaps xmm0, xmm2
    ret

sym.tstPlus ();
    addss xmm0, dword [0x00000944]
    ret

 *───────────────────*
*    asm with inline   *
 *───────────────────*

sym.testas1 ();
    addss xmm1, dword [0x00000904]
    addss xmm0, xmm1 ;
    ret

sym.testas2 ();
    addss xmm1, dword [0x00000904]
    subss xmm0, xmm1
    ret

*/