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created by

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1 hour ago

​x
        push(stack, cexp(pop(stack) * clog(pop(stack))));
 
#include <complex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/queue.h>
​
typedef struct node {
  double data;
  SLIST_ENTRY(node) link;
} NODE;
​
typedef SLIST_HEAD(, node) STACK;
​
void push(STACK *stack, double data) {
  NODE *node = malloc(sizeof(NODE));
  node->data = data;
  SLIST_INSERT_HEAD(stack, node, link);
}
​
double pop(STACK *stack) {
  double data = SLIST_FIRST(stack)->data;
  SLIST_REMOVE_HEAD(stack, link);
  return data;
}
​
int main(void) {
  char *line = NULL;
  size_t len = 0;

Editor settings:

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$ gcc prog.c -Wall -Wextra -std=gnu11 "-lm"

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​
 
3 4 2 * 1 5 - 2 3 ^ ^ / +​

Run (or Ctrl+Enter)

#permlink

Code

[C] gcc HEAD 10.0.0 20190605 (experimental)

#include <complex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/queue.h>

typedef struct node {
  double data;
  SLIST_ENTRY(node) link;
} NODE;

typedef SLIST_HEAD(, node) STACK;

void push(STACK *stack, double data) {
  NODE *node = malloc(sizeof(NODE));
  node->data = data;
  SLIST_INSERT_HEAD(stack, node, link);
}

double pop(STACK *stack) {
  double data = SLIST_FIRST(stack)->data;
  SLIST_REMOVE_HEAD(stack, link);
  return data;
}

int main(void) {
  char *line = NULL;
  size_t len = 0;

  while (getline(&line, &len, stdin) != -1) {
    line[strcspn(line, "\r\n")] = '\0';
    char *op;
    STACK *stack = malloc(sizeof(STACK));

    while ((op = strsep(&line, " ")) != NULL) {
      if (!strcmp(op, "+")) {
        push(stack, pop(stack) + pop(stack));
      } else if (!strcmp(op, "-")) {
        push(stack, -(pop(stack) - pop(stack)));
      } else if (!strcmp(op, "*")) {
        push(stack, pop(stack) * pop(stack));
      } else if (!strcmp(op, "/")) {
        push(stack, 1 / (pop(stack) / pop(stack)));
      } else if (!strcmp(op, "^")) {
        push(stack, cexp(pop(stack) * clog(pop(stack))));
      } else {
        push(stack, strtod(op, NULL));
      }
    }

    printf("%g\n", pop(stack));
  }

  return 0;
}

3 4 2 * 1 5 - 2 3 ^ ^ / +

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