#include<stdio.h>
int main()
{
    char sex;
    float faHeight,moHeight,clHeight;
   
    printf("请输入你的性别：");
  sex=getchar();
  scanf("%c",&sex);

printf("请输入你父亲的身高：");
scanf("%f",&faHeight);

    printf("请输入你母亲的身高：");
    scanf("%f",&moHeight);
   
    if(sex='F'){
    clHeight=(faHeight+moHeight)*0.54;}
    else{
    clHeight=(faHeight*0.923+moHeight)/2;}
        printf("成人时身高是%.2fcm",clHeight);
   return 0;
}

if(sex='F'){
    clHeight=(faHeight+moHeight)*0.54;}
    else{

//online parser: https://www.bccn.net/run/

#include <stdio.h>

int main(int argc, char *argv[])
{
    char gender;
    float Dad_Ht, Mummy_Ht, __Ht;
#define V_DBG
#ifndef V_DBG
    printf("请输入你的性别：");
    /* scanf("%c", &gender); */
    printf("请输入你父亲的身高：");
    /* scanf("%f", &Dad_Ht); */
    printf("请输入你母亲的身高：");
    /* scanf("%f", &Mummy_Ht); */
#else
#define _GENDER 'F'
    gender = _GENDER;
    Dad_Ht = 180.01;
    Mummy_Ht = 170.25;
#endif
#define to_upper(_c) (_c &= ~0x20)
    if (to_upper(gender) == 'M') 
        __Ht = (Dad_Ht + Mummy_Ht) * 0.54;
    else if (to_upper(gender) == 'F')
        __Ht = (Dad_Ht * 0.923 + Mummy_Ht) / 2;
    else __Ht = 0;
        
    printf("成人时身高是%.2fcm", __Ht);
        
    return 0;
}

output sample:
成人时身高是168.20cm

问一下我这个错在哪里呜呜

if(sex='F') 判断要用 ==