first commit

cv3/program.c

@@ -0,0 +1,99 @@
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <stdlib.h>
+
+#define STACK_SIZE 20
+
+struct stack{
+    float values[STACK_SIZE];
+    int size;
+};
+
+void print_stack(struct stack* stack);
+void push_stack(struct stack* stack, float value);
+float pop_stack(struct stack* stack);
+int count_stack(struct stack* stack);
+
+
+
+int main(){
+    
+
+    char char_value[STACK_SIZE];
+    memset(&char_value,0,STACK_SIZE);
+    float float_value;
+    char* ptr;
+    struct stack myStack;
+    memset(&myStack,0,sizeof(struct stack));
+    while(1){
+        ptr = fgets(char_value, STACK_SIZE-1, stdin);
+        if(ptr != NULL ){
+            float_value = strtof(char_value, NULL);
+            if(float_value == 0){
+                if(char_value[0] == '+'){
+                    float a = pop_stack(&myStack);
+                    float b = pop_stack(&myStack);                    
+                    float c = a+b;
+                    push_stack(&myStack, c);
+                    print_stack(&myStack);
+                    printf("\n");
+                }
+                if(char_value[0] == '-'){
+                    float a = pop_stack(&myStack);
+                    float b = pop_stack(&myStack);                    
+                    float c = a-b;
+                    push_stack(&myStack, c);
+                    print_stack(&myStack);
+                    printf("\n");
+                }
+                if(char_value[0] == '*'){
+                    float a = pop_stack(&myStack);
+                    float b = pop_stack(&myStack);                    
+                    float c = a*b;
+                    push_stack(&myStack, c);
+                    print_stack(&myStack);
+                    printf("\n");
+                } 
+                if(char_value[0] == '/'){
+                    float a = pop_stack(&myStack);
+                    float b = pop_stack(&myStack);                    
+                    float c = a/b;
+                    push_stack(&myStack, c);
+                    print_stack(&myStack);
+                    printf("\n");
+                }
+ 
+            }else { 
+                push_stack(&myStack, float_value);
+                print_stack(&myStack);
+                printf("\n");
+            }
+        }else{
+            break;
+        }
+    } 
+
+
+    return 0;
+}
+
+void print_stack(struct stack* stack){
+    printf(">");
+    for(int i = 0; i < stack->size; i++){
+        printf(" %f ",stack->values[i]);
+    }
+}
+
+void push_stack(struct stack* stack, float value){
+    assert(stack->size < STACK_SIZE);
+    stack->values[stack->size] = value;
+    stack->size += 1;
+}
+
+float pop_stack(struct stack* stack){
+    assert(stack->size > 0);
+    float value = stack->values[stack->size-1];
+    stack->size -= 1;
+    return value;
+}