C语言:计算器

题目

请你编写一个科学计算器，支持多括号嵌套的四则运算，三角函数及指数对数运算功能可选（功能越多越好，指数的输入格式为 a^b,对数的输入格式为 loga b，（其中a为底数））

代码

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


typedef struct {
    int flg[100];
    double num[100];
    int topNum;
    int topFlg;
    int sumFlg;
}stack;

int isNumFull(stack *s){
    if(s->topNum == 100)
        return 1;
    return 0;
}

int isFlgFull(stack *s){
    if(s->topFlg == 100)
        return 1;
    return 0;
}

int isNumEmpty(stack *s){
    if(s->topNum == 0)
        return 1;
    return 0;
}

int isFlgEmpty(stack *s){
    if(s->topFlg == 0)
        return 1;
    return 0;
}

double popNum(stack *s){
    if(isNumEmpty(s))
        return -114514;

    s->topNum = (s->topNum) - 1;
    return s->num[(s->topNum)];
}

int popFlg(stack *s){
    if(isFlgEmpty(s))
        return '0';

    s->topFlg = (s->topFlg) - 1;
    if(s->flg[(s->topFlg)] != '('){
        s->sumFlg--;
    }
    return s->flg[(s->topFlg)];
}

int pushNum(stack *s,double *a){
    if(isNumFull(s))
        return 0;

    s->num[(s->topNum)] = *a;
    s->topNum = (s->topNum) + 1;
    *a = 0;
    return 1;
}

int pushFlg(stack *s,int a){
    if(isFlgFull(s))
        return 0;

    s->flg[(s->topFlg)] = a;
    s->topFlg = (s->topFlg) + 1;
    if(a != '('){
        s->sumFlg++;
    }
    return 1;
}

double function1(double a1,double a2,int flg){
    switch(flg){
        case '+':
            return a1 + a2;
        case '-':
            return a1 - a2;
        case '*':
            return a1 * a2;
        case '/':
            return a1 / a2;
        case '^':
            return pow(a1,a2);
    }
    return 0;
}

double function2(double a, int fuc){
    a = a / 180 * 3.1415926535;
    switch(fuc){
        case 330:	//sin
            return sin(a);
        case 325:	//cos
            return cos(a);
        case 323:	//tan
            return sin(a) / cos(a);
        case 315:	//sec
            return 1 / cos(a);
        case 313:	//csc
            return 1 / sin(a);
        case 326:	//cot
            return cos(a) / sin(a);
    }
    return 0;
}

double function3(double a1,double a2){
    return log(a2) / log(a1);
}

double getNum(double *lf){
    return scanf("%lf",lf);
}

int main() {
    char inp[1],tmp[1];
    double t1 = 0;
    double t2 = 0;
    int fuc,i;
    stack s, *p;
    s.topFlg = 0;
    s.topNum = 0;
    s.sumFlg = 0;
    p = &s;

    if ((inp[0] = getchar()) == '-') {
        getNum(&t1);
        t1 = 0 - t1;
        pushNum(p, &t1);
    }
    else{
        goto label1;
    }

    while (1) {
        inp[0] = getchar();
        label1:

        if (inp[0] >= '0' && inp[0] <= '9') {
            t1 = t1 * 10 + inp[0] - '0';
            continue;
        }
        if(inp[0] == '.'){
            getNum(&t2);
            for(;t2>1;t2 /= 10);
            t1 = t1 + t2;
            t2 = 0;
        }

        if (t1 != 0)
            pushNum(p, &t1);

        if(inp[0] == '\n' || inp[0] == EOF ){
            break;
        }

        if (inp[0] >= 'a' && inp[0] <= 'z') {
            fuc = inp[0];
            fuc += getchar();
            fuc += getchar();
            getNum(&t1);
            if(fuc == 322){
                getchar();
                getNum(&t2);
                t1 = function3(t1,t2);
            }
            else {
                t1 = function2(t1, fuc);
            }
            pushNum(p, &t1);
            continue;
        }

        if (inp[0] == '+' || inp[0] == '(') {
            pushFlg(p, inp[0]);
            continue;
        }

        if (inp[0] == '-'){
            if (getNum(&t1) == 0){
                pushFlg(p, inp[0]);
            } else {
                t1 = -t1;
                pushNum(p, &t1);
                if(p->sumFlg == p->topNum -2){
                    pushFlg(p, '+');
                }
            }

        }

        if (inp[0] == '*' || inp[0] == '/' || inp[0] == '^') {
            tmp[0] = inp[0];
            if(0 == getNum(&t2)){       //为括号或者是负号
                fuc = getchar();
                if(fuc == '('){
                    pushFlg(p, inp[0]);
                    pushFlg(p, '(');
                    continue;
                } else if (fuc == '+' || fuc == '-' || fuc == '*' || fuc == '/' || fuc == '^'){
                    getNum(&t2);
                    t2 = -t2;
                } else {
                    fuc += getchar();
                    fuc += getchar();
                    getNum(&t1);
                    if(fuc == 322){
                        getchar();
                        getNum(&t2);
                        t1 = function3(t1,t2);
                    }
                    else {
                        t1 = function2(t1, fuc);
                    }
                    t2 = t1;
                 }
            }
            t1 = popNum(p);
            t1 = function1(t1, t2, tmp[0]);
            pushNum(p, &t1);
            continue;
        }

        if (inp[0] == ')') {
            while ((fuc = popFlg(p)) != '(') {
                t2 = popNum(p);
                t1 = popNum(p);
                t1 = function1(t1, t2, fuc);
                pushNum(p, &t1);
            }
            continue;
        }
    }

    while (p->topNum != 1) {
        fuc = popFlg(p);
        t2 = popNum(p);
        t1 = popNum(p);
        i = fuc;
        fuc = popFlg(p);
        if(fuc == '-') {
            t1 = 0 - t1;
            fuc = '+';
        }
        pushFlg(p,fuc);
        t1 = function1(t1, t2, i);
        pushNum(p, &t1);
    }

    printf("%lf",p->num[0]);

    return 0;
}