From 1aff928a0dbd2b5cb621ea0eac4533a5c410fc0b Mon Sep 17 00:00:00 2001 From: vj586da Date: Fri, 22 Oct 2021 01:16:39 +0200 Subject: [PATCH] added comments and aesthetic changes --- cv3/program.c | 185 +++++++++++++++++++++++++++++--------------------- 1 file changed, 106 insertions(+), 79 deletions(-) diff --git a/cv3/program.c b/cv3/program.c index 5594b67..187564a 100644 --- a/cv3/program.c +++ b/cv3/program.c @@ -1,122 +1,107 @@ #include -#include #include #include -#include #include #define STACK_SIZE 10 -struct stack{ +struct stack{ //definition of STACK struct float values[STACK_SIZE]; int size; }; -void print_stack(struct stack* stack); +//function which prints contents of stack +void print_stack(struct stack* stack); + +//function to append element into stack void push_stack(struct stack* stack, float value); + +//function to delete last element of stack float pop_stack(struct stack* stack); +//function to sum last 2 operands from stack +void sum(struct stack* stack); + +//function to substract last 2 operands from stack +void substract(struct stack* stack); + +//function to multiply last 2 operands from stack +void multip(struct stack* stack); + +//function to divide last 2 operands from stack +void divis(struct stack* stack); + int main(){ + char char_value[STACK_SIZE]; //definition of input array - 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)); + memset(&char_value,0,STACK_SIZE); //inicialization of input array + + float float_value; //variable to which we convert number from input array (char_value[]) + char* ptr; //return pointer of fgets + struct stack myStack; //struct myStach of type stack + memset(&myStack,0,sizeof(struct stack)); //initialization of myStruct structure while(1){ - if(myStack.size == 10){ - //print_stack(&myStack); + if(myStack.size == 10){ //condition to break the cycle if we have full stack puts("full stack"); break; } - - - + //load input into char_value ptr = fgets(char_value, STACK_SIZE-1, stdin); - if(ptr != NULL){ - - if(char_value[0] == '\n'){ + if(ptr != NULL){ //check if it run ok + if(char_value[0] == '\n'){ //if first char is \n, break the cycle, its the end puts("no input"); break; } - - /*if(char_value[0] == '0'){ - push_stack(&myStack,0); - print_stack(&myStack); - printf("\n"); - continue; - }*/ - + + //sum if(char_value[0] == '+'){ if(myStack.size > 1){ - float a = pop_stack(&myStack); - float b = pop_stack(&myStack); - float c = a+b; - push_stack(&myStack, c); - print_stack(&myStack); - printf("\n"); + sum(&myStack); }else{puts("not enough operands"); break;} - }else if(char_value[0] == '-'){ + } + + //substraction + else if(char_value[0] == '-'){ if(myStack.size > 1){ - float a = pop_stack(&myStack); - float b = pop_stack(&myStack); - float c = b-a; - push_stack(&myStack, c); - print_stack(&myStack); - printf("\n"); + substract(&myStack); }else{puts("not enough operands"); break;} - }else if(char_value[0] == '*'){ + } + + //multiplication + else if(char_value[0] == '*'){ if(myStack.size > 1){ - float a = pop_stack(&myStack); - float b = pop_stack(&myStack); - float c = a*b; - push_stack(&myStack, c); - print_stack(&myStack); - printf("\n"); + multip(&myStack); }else{puts("not enough operands"); break;} - } else if(char_value[0] == '/'){ + } + + //division + else if(char_value[0] == '/'){ if(myStack.size > 1){ - float a = pop_stack(&myStack); - if(a == 0){ - printf("division by zero\n"); - break; - }else{ - float b = pop_stack(&myStack); - float c = b/a; - push_stack(&myStack, c); - print_stack(&myStack); - printf("\n"); - } + divis(&myStack); }else{puts("not enough operands"); break;} - } else if(isdigit(char_value[0]) != 0 ){ + } + + //if its a number + else if(isdigit(char_value[0]) != 0 ){ float_value = strtof(char_value, NULL); - //printf("float value: %f\n",float_value); - /*if(float_value == 0){ - puts("bad input"); - break;*/ - //} else { - push_stack(&myStack,float_value); - print_stack(&myStack); - printf("\n"); - continue; - - } else { - puts("bad input"); - break; - } - } else { - //push_stack(&myStack, float_value); - //print_stack(&myStack); - //printf("\n"); - puts("no input"); + push_stack(&myStack,float_value); + print_stack(&myStack); + printf("\n"); + continue; + } else { + puts("bad input"); //if its not digit nor symbol of operation, break cycle, bad input break; } - } + //if theres no further input + } else { + puts("no input"); + break; + } + } return 0; @@ -141,3 +126,45 @@ float pop_stack(struct stack* stack){ return value; } +void sum(struct stack* stack){ + float a = pop_stack(stack); + float b = pop_stack(stack); + float c = a+b; + push_stack(stack, c); + print_stack(stack); + printf("\n"); +} + +void substract(struct stack* stack){ + float a = pop_stack(stack); + float b = pop_stack(stack); + float c = b-a; + push_stack(stack, c); + print_stack(stack); + printf("\n"); +} + +void multip(struct stack* stack){ + float a = pop_stack(stack); + float b = pop_stack(stack); + float c = a*b; + push_stack(stack, c); + print_stack(stack); + printf("\n"); +} + + + +void divis(struct stack* stack){ + float a = pop_stack(&myStack); + if(a == 0){ + printf("division by zero\n"); + break; + }else{ + float b = pop_stack(&myStack); + float c = b/a; + push_stack(&myStack, c); + print_stack(&myStack); + printf("\n"); + } +}