cv3

cv3/program.c

@@ -0,0 +1,77 @@
+#include <assert.h> 
+#include <stdio.h> 
+#include <stdlib.h>
+#include <string.h>
+
+#define STACK_SIZE 100
+
+struct stack {
+    float values[STACK_SIZE];
+    int size;
+};
+
+void push(struct stack* stack,float values){
+    assert(stack->size < STACK_SIZE);
+    stack->values[stack->size] = values;
+    stack->size += 1;
+}
+
+float pop(struct stack *stack){
+    assert(stack->size > 0);
+    float values = stack->values[stack->size-1]; 
+    stack->size -= 1; 
+    return values; 
+}
+void print_stack(struct stack *stack){
+    int i;
+    int len = stack->size - 1;
+    for(i = 0; i < len; i++){
+        printf("%0.2g ", stack->values[i]);
+    }
+    if(stack->size != 0){
+        printf("%0.2g ", stack->values[i]);
+    }
+    printf("\n");
+
+}
+
+
+int main() {
+    struct stack mystack;
+    memset(&mystack, 0, sizeof(struct stack));
+    int i = 0;
+    for(i = 0; i < 10000; i++){
+        char line[10];
+        char *x = fgets(line, 10, stdin);
+        float r = 0;
+         
+        if(!isdigit(line[0]) && line[0] != '+' && line[0] != '*' && line[0] != '/' && line[0] != '-'){
+            return 0;
+        }       
+        
+        if(line[0] == '+'){
+            r = pop(&mystack) + pop(&mystack); 
+        }
+        else if(line[0] == '-'){
+            r = pop(&mystack) - pop(&mystack);
+        }
+        else if(line[0] == '*'){
+            r = pop(&mystack) * pop(&mystack);
+        }
+        else if(line[0] == '/'){
+            r = pop(&mystack) / pop(&mystack);
+        }
+
+        else {
+            r = strtof(line,&x);
+        }      
+        
+        push(&mystack,r);
+        print_stack(&mystack);
+            
+    }
+
+
+
+    return 0;
+}