c data types data structures code example

Example 1: c data types

Type	             Size (bytes)	                     Format Specifier
int	                at least 2, usually 4	                 %d, %i
char	             1	                                     %c
float	             4	                                     %f
double	             8	                                     %lf
short int	         2 usually	                             %hd
unsigned int        at least 2, usually 4	                 %u
long int	        at least 4, usually 8	                 %ld, %li
long long int	        at least 8	                         %lld, %lli
unsigned long int	    at least 4	                         %lu
unsigned long long int	at least 8	                         %llu
signed char           	1	                                 %c
unsigned char	        1	                                 %c
long double	      at least 10, usually 12 or 16	             %Lf

Example 2: data structures in c

// Stack implementation in C

#include 
#include 

#define MAX 10

int count = 0;

// Creating a stack
struct stack {
  int items[MAX];
  int top;
};
typedef struct stack st;

void createEmptyStack(st *s) {
  s->top = -1;
}

// Check if the stack is full
int isfull(st *s) {
  if (s->top == MAX - 1)
    return 1;
  else
    return 0;
}

// Check if the stack is empty
int isempty(st *s) {
  if (s->top == -1)
    return 1;
  else
    return 0;
}

// Add elements into stack
void push(st *s, int newitem) {
  if (isfull(s)) {
    printf("STACK FULL");
  } else {
    s->top++;
    s->items[s->top] = newitem;
  }
  count++;
}

// Remove element from stack
void pop(st *s) {
  if (isempty(s)) {
    printf("\n STACK EMPTY \n");
  } else {
    printf("Item popped= %d", s->items[s->top]);
    s->top--;
  }
  count--;
  printf("\n");
}

// Print elements of stack
void printStack(st *s) {
  printf("Stack: ");
  for (int i = 0; i < count; i++) {
    printf("%d ", s->items[i]);
  }
  printf("\n");
}

// Driver code
int main() {
  int ch;
  st *s = (st *)malloc(sizeof(st));

  createEmptyStack(s);

  push(s, 1);
  push(s, 2);
  push(s, 3);
  push(s, 4);

  printStack(s);

  pop(s);

  printf("\nAfter popping out\n");
  printStack(s);
}