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#include <stdio.h>#include<string.h>#include <math.h>#include <stdlib.h>、void start(); /*定义各函数*/void main(){ void a(); void b(); void c(); void d(); void e(); int n; while(n!=6) //界面 { printf (" 请选择你要计算的方法: \n"); printf (" 加法请按_1 \n"); printf (" 减法请按_2 \n"); printf (" 乘法请按_3 \n"); printf (" 除法请按_4 \n"); printf (" 进制转换_5 \n"); printf (" 退出_6 \n"); printf("输入选项代码:"); { // 输入的选项不对 printf(" 请输入正确的数字。\n\n"); } scanf("%d",&n); switch(n) { case 1:a();break; case 2:b();break; case 3:c();break; case 4:d();break; case 5:e();break; case 6:printf("\n*******************谢谢使用！*******************\n");break; break; } } getchar();} /*子函数*/ void a() { // 加法 double x, y, Result; printf (" 请输入被加数:"); scanf ("%lf",&x); printf (" 请输入加数:"); scanf ("%lf",&y); Result = x + y; printf (" 结果是: %lf\n\n",Result); { // 求出结果 printf(" 结果以得。\n\n"); } system ("pause"); //按任意键继续 system ("cls"); //清屏 } /*子函数*/ void b() { // 减法 double x, y, Result; printf (" 请输入被减数:"); scanf ("%lf",&x); printf (" 请输入减数:"); scanf ("%lf",&y); Result =x -y; printf (" 结果是: %lf\n\n",Result); { // 求出结果 printf(" 结果以得。\n\n"); } system ("pause"); //按任意键继续 system ("cls"); //清屏 } /*子函数*/ void c() { // 乘法 double x, y, Result; printf (" 请输入被乘数:"); scanf ("%lf",&x); printf (" 请输入乘数:"); scanf ("%lf",&y); Result =x * y; printf (" 结果是: %lf\n\n",Result); { // 求出结果 printf(" 结果以得。\n\n"); } system ("pause"); //按任意键继续 system ("cls"); //清屏 } /*子函数*/ void d() { // 除法 double x, y, Result; printf (" 请输入被除数:"); scanf ("%lf",&x); printf (" 请输入除数:"); scanf ("%lf",&y); Result =x/ y; printf (" 结果是: %lf\n\n",Result); { // 求出结果 printf(" 结果以得。\n\n"); } system ("pause"); //按任意键继续 system ("cls"); //清屏 } /*子函数*/ void e() { //进制转换的代码 int Ary_10; //定义进制的变量 char string[32]; //二进制变量定义 printf("请输入需要转换的十进制数:"); scanf("%d", &Ary_10); itoa (Ary_10, string ,2); printf("二进制: %s\n", &string); printf("八进制: %o\n", &Ary_10); printf("十六进制: %x\n", &Ary_10); { // 求出结果 printf(" 结果以得。\n\n"); } system ("pause"); //按任意键继续 system ("cls"); //清屏 }
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源代码大师 2021-05-06
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希望对你有帮助：https://blog.csdn.net/it_xiangqiang/category_10581430.html
希望对你有帮助：https://blog.csdn.net/it_xiangqiang/category_10768339.html
赵4老师 2021-03-05
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#pragma warning(disable:4996)
/*---------------------------------------
函数型计算器(VC++6.0,Win32 Console)
功能：
目前提供了10多个常用数学函数:
⑴正弦sin
⑵余弦cos
⑶正切tan
⑷开平方sqrt
⑸反正弦arcsin
⑹反余弦arccos
⑺反正切arctan
⑻常用对数lg
⑼自然对数ln
⑽ｅ指数exp
⑾乘幂函数^
⑿向上取整ceil
⒀向下取整floor
⒁四舍五入取整round
⒂取符号sign
⒃取绝对值abs
用法：
如果要求2的32次幂，可以打入2^32<回车>
如果要求30度角的正切可键入tan(Pi/6)<回车>
注意不能打入：tan(30)<Enter>
如果要求1.23弧度的正弦，有几种方法都有效：
sin(1.23)<Enter>
sin 1.23 <Enter>
sin1.23 <Enter>
如果验证正余弦的平方和公式,可打入sin(1.23)^2+cos(1.23)^2 <Enter>或sin1.23^2+cos1.23^2 <Enter>
此外两函数表达式连在一起,自动理解为相乘如：sin1.23cos0.77+cos1.23sin0.77就等价于sin(1.23)*cos(0.77)+cos(1.23)*sin(0.77)
当然你还可以依据三角变换，再用sin(1.23+0.77)也即sin2验证一下。
本计算器充分考虑了运算符的优先级因此诸如：2+3*4^2 实际上相当于：2+(3*(4*4))
另外函数名前面如果是数字,那么自动认为二者相乘.
同理，如果某数的右侧是左括号，则自动认为该数与括弧项之间隐含一乘号。
如：3sin1.2^2+5cos2.1^2 相当于3*sin2(1.2)+5*cos2(2.1)
又如：4(3-2(sqrt5-1)+ln2)+lg5 相当于4*(3-2*(√5 -1)+loge(2))+log10(5)
此外，本计算器提供了圆周率Pi键入字母时不区分大小写,以方便使用。
16进制整数以0x或0X开头。
----------------------------------------*/
#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <cmath>
#include <stdio.h>
#include <string.h>
#include <windows.h>
using namespace std;
const char Tab = 0x9;
const int DIGIT = 1;
const int MAXLEN = 16384;
char s[MAXLEN], *endss;
int pcs = 15;
double sign(double dVal) {
if (dVal>0.0) return 1.0;
else if (dVal<0.0) return -1.0;
else return 0.0;
}
double round(double dVal, short iPlaces) {//iPlaces>=0
char s[30];
double dRetval;
sprintf(s, "%.*lf", iPlaces, dVal);
sscanf(s, "%lf", &dRetval);
return (dRetval);
}
double fun(double x, char op[], int *iop) {
while (op[*iop - 1]<32) //本行使得函数嵌套调用时不必加括号,如 arc sin(sin(1.234)) 只需键入arc sin sin 1.234<Enter>
switch (op[*iop - 1]) {
case 7: x = sin(x); (*iop)--; break;
case 8: x = cos(x); (*iop)--; break;
case 9: x = tan(x); (*iop)--; break;
case 10: x = sqrt(x); (*iop)--; break;
case 11: x = asin(x); (*iop)--; break;
case 12: x = acos(x); (*iop)--; break;
case 13: x = atan(x); (*iop)--; break;
case 14: x = log10(x); (*iop)--; break;
case 15: x = log(x); (*iop)--; break;
case 16: x = exp(x); (*iop)--; break;
case 17: x = ceil(x); (*iop)--; break;
case 18: x = floor(x); (*iop)--; break;
case 19: x = round(x,0);(*iop)--; break;
case 20: x = sign(x); (*iop)--; break;
case 21: x = fabs(x); (*iop)--; break;
}
return x;
}
double calc(char *expr, char **addr) {
static int deep; //递归深度
static char *fname[] = { "sin","cos","tan","sqrt","arcsin","arccos","arctan","lg","ln","exp","ceil","floor","round","sign","abs",NULL };
double ST[10] = { 0.0 }; //数字栈
char op[10] = { '+' }; //运算符栈
char c, *rexp, *pp, *pf;
int ist = 1, iop = 1, last, i, n;
__int64 i64;
if (!deep) {
pp = pf = expr;
do {
c = *pp++;
if (c != ' '&& c != Tab)
*pf++ = c;
} while (c != '\0');
}
pp = expr;
if ((c = *pp) == '-' || c == '+') {
op[0] = c;
pp++;
}
last = !DIGIT;
while ((c = *pp) != '\0') {
if (c == '(') {//左圆括弧
deep++;
ST[ist++] = calc(++pp, addr);
deep--;
ST[ist - 1] = fun(ST[ist - 1], op, &iop);
pp = *addr;
last = DIGIT;
if (*pp == '(' || isalpha(*pp) && strnicmp(pp, "Pi", 2)) {//目的是：当右圆括弧的右恻为左圆括弧或函数名字时，默认其为乘法
op[iop++] = '*';
last = !DIGIT;
c = op[--iop];
goto operate;
}
}
else if (c == ')') {//右圆括弧
pp++;
break;
}
else if (isalpha(c)) {
if (!strnicmp(pp, "Pi", 2)) {
if (last == DIGIT) {
wcout << L"π左侧遇）" << endl; exit(1);
}
ST[ist++] = 3.14159265358979323846264338328;
ST[ist - 1] = fun(ST[ist - 1], op, &iop);
pp += 2;
last = DIGIT;
if (!strnicmp(pp, "Pi", 2)) {
wcout << L"两个π相连" << endl; exit(2);
}
if (*pp == '(') {
wcout << L"π右侧遇（" << endl; exit(3);
}
}
else {
for (i = 0; (pf = fname[i]) != NULL; i++)
if (!strnicmp(pp, pf, strlen(pf))) break;
if (pf != NULL) {
op[iop++] = 07 + i;
pp += strlen(pf);
}
else {
wcout << L"陌生函数名" << endl; exit(4);
}
}
}
else if (c == '+' || c == '-' || c == '*' || c == '/' || c == '%' || c == '^') {
char cc;
if (last != DIGIT) {
wcout << L"运算符粘连" << endl; exit(5);
}
pp++;
if (c == '+' || c == '-') {
do {
cc = op[--iop];
--ist;
switch (cc) {
case '+': ST[ist - 1] += ST[ist]; break;
case '-': ST[ist - 1] -= ST[ist]; break;
case '*': ST[ist - 1] *= ST[ist]; break;
case '/': ST[ist - 1] /= ST[ist]; break;
case '%': ST[ist - 1] = fmod(ST[ist - 1], ST[ist]); break;
case '^': ST[ist - 1] = pow(ST[ist - 1], ST[ist]); break;
}
} while (iop);
op[iop++] = c;
}
else if (c == '*' || c == '/' || c == '%') {
operate: cc = op[iop - 1];
if (cc == '+' || cc == '-') {
op[iop++] = c;
}
else {
--ist;
op[iop - 1] = c;
switch (cc) {
case '*': ST[ist - 1] *= ST[ist]; break;
case '/': ST[ist - 1] /= ST[ist]; break;
case '%': ST[ist - 1] = fmod(ST[ist - 1], ST[ist]); break;
case '^': ST[ist - 1] = pow(ST[ist - 1], ST[ist]); break;
}
}
}
else {
cc = op[iop - 1];
if (cc == '^') {
wcout << L"乘幂符连用" << endl; exit(6);
}
op[iop++] = c;
}
last = !DIGIT;
}
else {
if (last == DIGIT) {
wcout << L"两数字粘连" << endl; exit(7);
}
if (pp[0] == '0' && (pp[1] == 'x' || pp[1] == 'X')) {
sscanf(pp + 2, "%I64x%n", &i64, &n);
rexp = pp + 2 + n;
ST[ist++] = (double)i64;
}
else ST[ist++] = strtod(pp, &rexp);
ST[ist - 1] = fun(ST[ist - 1], op, &iop);
if (pp == rexp) {
wcout << L"非法字符" << endl; exit(8);
}
pp = rexp;
last = DIGIT;
if (*pp == '(' || isalpha(*pp)) {
op[iop++] = '*';
last = !DIGIT;
c = op[--iop];
goto operate;
}
}
}
*addr = pp;
if (iop >= ist) {
wcout << L"表达式有误" << endl; exit(9);
}
while (iop) {
--ist;
switch (op[--iop]) {
case '+': ST[ist - 1] += ST[ist]; break;
case '-': ST[ist - 1] -= ST[ist]; break;
case '*': ST[ist - 1] *= ST[ist]; break;
case '/': ST[ist - 1] /= ST[ist]; break;
case '%': ST[ist - 1] = fmod(ST[ist - 1], ST[ist]); break;
case '^': ST[ist - 1] = pow(ST[ist - 1], ST[ist]); break;
}
}
return ST[0];
}
int main(int argc, char **argv) {
int a;
wcout.imbue(locale("chs"));
if (argc<2) {
//if (GetConsoleOutputCP() != 936) system("chcp 936>NUL");//中文代码页
wcout << L"计算函数表达式的值。" << endl << L"支持(),+,-,*,/,%,^,Pi,sin,cos,tan,sqrt,arcsin,arccos,arctan,lg,ln,exp,ceil,floor,round,sign,abs" << endl;
while (1) {
wcout << L"请输入表达式：";
fgets(s,16384,stdin);
if ('\n' == s[strlen(s)-1]) s[strlen(s) - 1] = 0;
if (s[0] == 0) break;//
cout << s << "=";
cout << setprecision(15) << calc(s, &endss) << endl;
}
}
else if (argc == 2 && 0 == strcmp(argv[1], "/?")) {
//if (GetConsoleOutputCP() != 936) system("chcp 936>NUL");//中文代码页
wcout << L"计算由≥1个命令行参数给出的函数表达式的值。\n"
"最后一个参数是.0～.15表示将计算结果保留小数0～15位\n"
"最后一个参数是x表示将计算结果以16进制正整数格式输出\n"
"支持(),+,-,*,/,%,^^,Pi,sin,cos,tan,sqrt,arcsin,arccos,arctan,lg,ln,exp,ceil,floor,round,sign,abs\n"
"16进制整数以0x或0X开头\n";
}
else {
strncpy(s, argv[1], MAXLEN - 1); s[MAXLEN - 1] = 0;
if (argc>2) {
for (a = 2; a<argc - 1; a++) strncat(s, argv[a], MAXLEN - 1);//将空格间隔的各参数连接到s
if (1 == sscanf(argv[a], ".%d", &pcs) && 0 <= pcs && pcs <= 15) {//最后一个参数是.0～.15表示将计算结果保留小数0～15位
printf("%.*lf\n", pcs, calc(s, &endss));
}
else if (argv[a][0] == 'x' || argv[a][0] == 'X') {//最后一个参数是x表示将计算结果以16进制正整数格式输出
printf("0x%016I64x\n", (__int64)calc(s, &endss));
}
else {
strncat(s, argv[a], MAXLEN - 1);
printf("%.15lg\n", calc(s, &endss));
}
}
else {
printf("%.15lg\n", calc(s, &endss));
}
}
return 0;
}
