Cを使用して後置記法で計算を実行し、UNIXコマンドラインから値を読み取るプログラムを作成しようとしています。ただし、私は C 言語にまったく慣れていないため、正しく動作させるのに少し苦労しています。NULL およびセグメンテーション フォールトの読み取り値を取得していますが、UNIX コマンド ラインでのデバッグの仕組みがよくわからないため、どこでエラーが発生したのかわかりません。この問題について何か助けていただければ幸いです。
#include <stdio.h>
double stack(int argc, char* argv[]);
int main(int argc, char* argv[]) {
double result;
result = stack(argc, argv);
printf("%s\n", result);
}
--
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
static double stck[100];
static int top = 0;
/*Push Function*/
static void push( double v){
stck[top] = v; /* Places the value at the current top position of the stack */
top++; /* Increases the top position of the stack */
printf("%s\n", top);
}
/*Pop Function*/
static double pop() {
double ret;
ret = stck[top]; /* Stores the value of the top position in the stack to ret */
top--; /* Decreases the top position of the stack */
printf("%s\n", top);
return ret; /* Returns the value of ret */
}
double stack(int argc, char* argv[]){
double h; /* Placeholder Variable for the result of the mathematic equations during the loop */
int i;
for (i = 0; i <= argc - 1; i++) { /* Loops to read in all values, barring the first, for argv */
if (strcmp(argv[i], "*") == 0) {
double a = pop(); /* Pulls in the top value of the stack */
double b = pop(); /* Pulls in the next top value of the stack*/
h = b*a; /* Performs the multiplication of the two stack values */
push(h); /* Returns the result to the top of the stack */
} else if (strcmp(argv[i], "+") == 0) {
printf("%s\n", "Made it here plus \0");
double a = pop(); /* Pulls in the top value of the stack */
double b = pop(); /* Pulls in the next top value of the stack*/
h = b+a; /* Performs the multiplication of the two stack values */
push(h); /* Returns the result to the top of the stack */
} else if (strcmp(argv[i], "/") == 0) {
double a = pop(); /* Pulls in the top value of the stack */
double b = pop(); /* Pulls in the next top value of the stack*/
h = b/a; /* Performs the division of the two stack values */
push(h); /* Returns the result to the top of the stack */
} else if (strcmp(argv[i], "^") == 0) {
double a = pop(); /* Pulls in the top value of the stack */
double b = pop(); /* Pulls in the next top value of the stack*/
h = pow(b,a); /* Raises the number b by the number a power */
push(h); /* Returns the result to the top of the stack */
} else if (strcmp(argv[i], "-") == 0) {
double a = pop(); /* Pulls in the top value of the stack */
double b = pop(); /* Pulls in the next top value of the stack*/
h = b-a; /* Performs the subtraction of the two stack values */
push(h); /* Returns the result to the top of the stack */
} else {
printf("%s\n", "Made it here \0");
double ph;
ph = (double)atof(argv[i]);
printf("%s\n", ph);
push(ph); /* Places the current value of argv[i] on the top of the stack */
}
}
return stck[0]; /* Returns the final result of the calculation to main.c */
}