第一个计算器
计算器
功能：
支持算数优先级，
支持指数运算 pow(double x,double y) 表示x^y，
以e为底的对数运算 log(),
以10为底的对数运算 log10(),
三角运算 sin(),cos(),tan(),
反正弦 asin(),acos(),atan(),
双曲正弦 sinh(),cosh(),tanh(),
开平方根 sqrt()
设计思路：
先将所输入的式子全部看成字符串，以加减乘除符号为分界线，将式子分割成许多单元；
以 %[.()0123456789abcdefghijklmnopqrstuvwxyz] 的方式将每个单元的字符串内容
保存起来再进入 FinalValue() 每个单元转换为最终的double型的值；
如此后式子就可以当成全部为double型变量处理。
注意：
()括号内全为double型,
不支持嵌套计算 比如无法计算sin(pow(a,b)),
由于思路是以加减乘除为分界线，所以输入的double型变量必须为正数。。。。。。。
#include
#include
#include
#include
#define M 100
#define N 10
#define sin(x) sin(3.1415926*(x)/180.0)
#define cos(x) cos(3.1415926*(x)/180.0)
#define tan(x) tan(3.1415926*(x)/180.0)
#define asin(x) asin(3.1415926*(x)/180.0)
#define acos(x) acos(3.1415926*(x)/180.0)
#define atan(x) atan(3.1415926*(x)/180.0)
#define sinh(x) sinh(3.1415926*(x)/180.0)
#define cosh(x) cosh(3.1415926*(x)/180.0)
#define tanh(x) tanh(3.1415926*(x)/180.0)
double FinalValue(char data[]);
double FinalValue(char data[]){
char func[N];
double func_num, func_num1;
char cfunc_num[N]={'\0'},cfunc_num1[N]={'\0'};
double final_value;
sscanf(data, "%[0123456789]", func);//判断data中开头的是否为数字
if(strlen(func)!=0){
final_value = atof(data);//atof函数将字符串转换为double型
}
else{
sscanf(data, "%[^(]", func);
if(strcmp(func,"pow\0")==0){
sscanf(data, "%*[^(](%[^,],%[^)]", cfunc_num, cfunc_num1);
func_num = atof(cfunc_num);
func_num1 = atof(cfunc_num1);
final_value = pow(func_num, func_num1);
return final_value;
}
sscanf(data,"%*[^(](%[^)]",cfunc_num);
func_num = atof(cfunc_num);
if (strcmp(func, "sin\0") == 0)
final_value = sin(func_num);
else if (strcmp(func, "cos\0") == 0)
final_value = cos(func_num);
else if (strcmp(func, "tan\0") == 0)
final_value = tan(func_num);
else if (strcmp(func, "asin\0") == 0)
final_value = asin(func_num);
else if (strcmp(func, "acos\0") == 0)
final_value = acos(func_num);
else if (strcmp(func, "atan\0") == 0)
final_value = atan(func_num);
else if (strcmp(func, "sinh\0") == 0)
final_value = sinh(func_num);
else if (strcmp(func, "cosh\0") == 0)
final_value = cosh(func_num);
else if (strcmp(func, "tanh\0") == 0)
final_value = tanh(func_num);
else if (strcmp(func, "sqrt\0") == 0)
final_value = sqrt(func_num);
else if (strcmp(func, "log\0") == 0)
final_value = log(func_num);
else if (strcmp(func, "log10\0") == 0)
final_value = log10(func_num);
else {
printf("Exist wrong function or wrong writing of function.");
exit(1);
}
}
return final_value;
}
int main()
{
double num[M] = {0};
char cStart_num[N]={'\0'};//最开头的数。
char data[N]={'\0'};//表示以运算符(+-*/)分隔开的每个单元，先将每个单元以字符串的形式储存起来，并进行后续分析。
double unit;//表示以运算符(+-*/)分隔开的每个单元的最终值。比如sin90°的最终值是1,11的最终值是11.
double sum;
char c;//运算符
while(scanf("%[.,()0123456789abcdefghijklmnopqrstuvwxyz]",cStart_num)!='\n')
{
num[0]=FinalValue(cStart_num);
int k=1;
while(scanf("%c",&c)!='\n')
{
if(c=='\n')
break;
else
{
scanf("%[.,()0123456789abcdefghijklmnopqrstuvwxyz]",data);
unit = FinalValue(data);
switch(c)
{
case'+':
k++;
num[k-1]=unit;
break;
case'-':
k++;
num[k-1]=-unit;
break;
case'*':
num[k-1]*=unit;
break;
case'/':
num[k-1]/=unit;
break;
}
}
}
int i;
sum=0;
for(i=0;i 第二个计算器
支持优先级（包括算术优先级和括号优先级），支持负数运算，支持小数运算，不支持特殊函数运算（如三角函数等）。代码写得很丑。。。。
#include
#include
#include
#define MAX_LEN 100
typedef enum { OK = 1, ERROR = 0 } Status;
float BasicOperate(char operationalFormula[]);
Status MidOperationalFormula(char *dst, char *src, int n, int m);
Status LeftOperationalFormula(char *dst, char *src, int n);
int NumOfBrackets(char operationalFormula[], int len);
float BasicOperate(char operationalFormula[]) {
float num[MAX_LEN] = {0};
char *tempOperationalFormula;
char operator;
float unit = 0;
char temp;
int k = 1;
int i;
int nn;
float sum = 0;
nn = strlen(operationalFormula);
operationalFormula[nn] = 'S';
tempOperationalFormula = operationalFormula;
sscanf(tempOperationalFormula, "%c", &temp);
if (temp == '-') {
tempOperationalFormula += 1;
sscanf(tempOperationalFormula, "%g", &unit);
tempOperationalFormula = strpbrk(tempOperationalFormula, "+-*/S");
num[0] = -unit;
} else {
sscanf(tempOperationalFormula, "%g", &unit);
tempOperationalFormula = strpbrk(tempOperationalFormula, "+-*/S");
num[0] = unit;
}
sscanf(tempOperationalFormula, "%c", &operator);
tempOperationalFormula += 1;
while (operator!= 'S') {
sscanf(tempOperationalFormula, "%c", &temp);
if (temp == '-') {
tempOperationalFormula += 1;
sscanf(tempOperationalFormula, "%g", &unit);
tempOperationalFormula = strpbrk(tempOperationalFormula, "+-*/S");
unit = -unit;
} else {
sscanf(tempOperationalFormula, "%g", &unit);
tempOperationalFormula = strpbrk(tempOperationalFormula, "+-*/S");
}
switch (operator) {
case '+':
k++;
num[k - 1] = unit;
break;
case '-':
k++;
num[k - 1] = -unit;
break;
case '*':
num[k - 1] *= unit;
break;
case '/':
if (unit == 0) {
printf("Illegal Input!\n");
break;
}
num[k - 1] /= unit;
break;
}
sscanf(tempOperationalFormula, "%c", &operator);
tempOperationalFormula += 1;
}
for (i = 0; i < k; i++) {
sum += num[i];
}
return sum;
}
Status LeftOperationalFormula(char *dst, char *src, int n) {
char *p = src;
char *q = dst;
while (n--)
*(q++) = *(p++);
*(q++) = '\0';
return OK;
}
Status MidOperationalFormula(char *dst, char *src, int n, int m) {
char *p = src;
char *q = dst;
p += m;
while (n--) {
*(q++) = *(p++);
}
*(q++) = '\0';
return OK;
}
int NumOfBrackets(char operationalFormula[], int len) {
int ret = -1;
int i;
int numOfLeftBrackets = 0;
int numOfRightBrackets = 0;
for (i = 0; i < len; i++) {
if (operationalFormula[i] == '(') {
numOfLeftBrackets++;
}
}
for (i = 0; i < len; i++) {
if (operationalFormula[i] == ')') {
numOfRightBrackets++;
}
}
if (numOfLeftBrackets == numOfRightBrackets) {
ret = numOfRightBrackets;
}
return ret;
}
int main(void) {
char operationalFormula[MAX_LEN + 1];
float sum, tempSum;
char tempValue[MAX_LEN + 1];
int n;
int len;
char leftOperationalFormula[MAX_LEN + 1],
basicOperationalFormula[MAX_LEN + 1], *rightOperationalFormula;
char *leftBracket, *rightBracket;
while (1) {
scanf("%s", operationalFormula);
len = strlen(operationalFormula);
n = NumOfBrackets(operationalFormula, len);
if (n < 0) {
printf("Illegal opeereational formula!\n");
continue;
}
printf("\n");
while (n--) {
leftBracket = strrchr(operationalFormula, '(');
rightBracket = strchr(operationalFormula, ')');
if (leftBracket - rightBracket > 0) {
rightBracket = strchr(leftBracket, ')');
}
LeftOperationalFormula(leftOperationalFormula, operationalFormula,
leftBracket - operationalFormula);
printf("leftOperationalFormula= %s\n", leftOperationalFormula);
rightOperationalFormula = rightBracket + 1;
printf("rightOperationalFormula= %s\n", rightOperationalFormula);
MidOperationalFormula(basicOperationalFormula, operationalFormula,
(rightBracket - operationalFormula) -
(leftBracket - operationalFormula) - 1,
leftBracket - operationalFormula + 1);
printf("basicOperationalFormula= %s\n", basicOperationalFormula);
tempSum = BasicOperate(basicOperationalFormula);
sprintf(tempValue, "%g", tempSum);
printf("tempValue= %s\n", tempValue);
strcpy(operationalFormula, leftOperationalFormula);
strcat(operationalFormula, tempValue);
strcat(operationalFormula, rightOperationalFormula);
printf("operationalFormula= %s\n\n", operationalFormula);
}
sum = BasicOperate(operationalFormula);
printf("%g", sum);
printf("\n");
fflush(stdin);
}
// printf("%d", sum);
return 0;
}
第三个计算器
用python实现，功能和第二个差不多。这就是为毛很想学python的原因了。
#计算器
i=eval(input("请输入式子："))
print("结果为：",i)