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The C programming language made simple

Generic data types in C

#include <stdio.h> #include <stdlib.h> #include <string.h> typedef enum { STACK_INT, STACK_CHAR, STACK_UINT64 } DataType; typedef struct Stack { DataType type; size_t size; void* data; void* top; } Stack; Stack stackCreate(size_t size, DataType type) { size_t effectiveSize = 0; if (type == STACK_CHAR) { effectiveSize = size * sizeof(char); } else if (type == STACK_INT) { effectiveSize = size * sizeof(int); } else if (type == STACK_UINT64) { effectiveSize = size * sizeof(unsigned long long); } Stack s = { .type = type, .size = size, .data = malloc(effectiveSize), .top = NULL; }; return s; } void stackDelete(Stack* s) { free(s->data); s->data = NULL; } void stackPush(Stack* s, void* elem) { // Homework ;) } int main(int argc, char* argv[]) { Stack s = stackCreate(10, STACK_INT); ((int*)s.data)[0] = 64; s.top = ((int*)s.data) + 0; ((int*)s.data)[1] = 128; s.top = ((int*)s.data) + 1; return 0; }