C语言 if语句练习题,if语句练习题，不明白哪里做错了，求指点

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#include

int main()

{

double fq = 0, mq = 0, xh = 0, t = 0, w = 0; /*父母亲 和孩子的身高*/

char xb = *x*, ty = *o*, ws = *l*; /*性别 体育 卫生*/

printf(" 身高估测系统nnn");

printf("是男生/女生(n/f)：");

scanf_s("%c", &xb);

printf("父亲身高：");

scanf_s("%lf", &fq);

printf("母亲身高：");

scanf_s("%lf", &mq);

printf("是否喜爱体育锻炼(y/n)：");

getchar();

scanf_s("%c", &ty);

printf("是否有良好的卫生习惯(y/n)：");

getchar();

scanf_s("%c", &ws);

if (xb == *n*) /*如果是男生*/

{

if (ty == *y*) /*如果爱好体育*/

{

xh = (fq + mq)*0.54;

xh = xh + (xh*0.02);

}

else if (ws == *y*) /*如果卫生习惯好*/

{

xh = (fq + mq)*0.54;

xh = xh + (xh*0.015);

}

else if (ty == *y*&& ws == *y*) /*如果体育卫生都可以*/

{

xh = (fq + mq)*0.54;

t = xh + (xh*0.02);

w = xh + (xh*0.015);

xh = t + w;

}

xh = (fq + mq)*0.54; /*否则 如果一样都没有*/

}

else if (xb == *f*) /*如果是女生*/

{

if (ty == *y*) /*如果爱好体育*/

{

xh = (fq*0.923 + mq) / 2.0;

xh = xh + (xh*0.02);

}

else if (ws == *y*) /*如果卫生习惯好*/

{

xh = (fq*0.923 + mq) / 2.0;

xh = xh + (xh*0.02);

}

else if (ty == *y*&& ws == *y*) /*如果体育卫生都可以*/

{

xh = (fq*0.923 + mq) / 2.0;

t = xh + (xh*0.02);

w = xh + (xh*0.015);

xh = t + w;

}

xh = (fq*0.923 + mq) / 2.0; /*否则 如果一样都没有*/

}

printf("估测小孩身高：%lf", xh);

return 0;

}