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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| char* | |
| join_string(const int elements, char** arr) | |
| { | |
| size_t lengths[elements]; | |
| size_t len = 0; | |
| for (int i=0; i<elements; i++) | |
| len += lengths[i] = strlen(arr[i]); | |
| char* str = malloc(len * sizeof(**arr) + 1); | |
| size_t offset = 0; | |
| for (int i=0; i<elements; i++) { | |
| memcpy(str+offset, arr[i], lengths[i]); | |
| offset += lengths[i]; | |
| } | |
| str[len] = '\0'; | |
| return str; | |
| } | |
| int | |
| main(const int argc, char** argv) | |
| { | |
| char* eval = join_string(argc-1, ++argv); | |
| const size_t len = strlen(eval) - 1; | |
| char* start_end; | |
| int result = strtol(eval, &start_end, 10); | |
| const int start = start_end - eval; | |
| if (start == 0) { | |
| printf("Expected a starting number, got %c", eval[0]); | |
| exit(-1); | |
| } | |
| for (int i = start; i<len; i++) { | |
| const int peek_num = strtol(eval+i+1, NULL, 10); | |
| switch (eval[i]) | |
| { | |
| case '+': | |
| result += peek_num; | |
| break; | |
| case '-': | |
| result -= peek_num; | |
| break; | |
| case '*': | |
| result *= peek_num; | |
| break; | |
| case '/': | |
| result /= peek_num; | |
| break; | |
| } | |
| } | |
| free(eval); | |
| printf("Result = %d", result); | |
| return 0; | |
| } |
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