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| #include <stdio.h> | |
| void read_term(const char **ptr); | |
| void read_factor(const char **ptr); | |
| void read_number(const char **ptr); | |
| void read_term(const char **ptr) | |
| { | |
| read_factor(ptr); | |
| if (**ptr == '+') { | |
| *ptr += 1; | |
| read_term(ptr); | |
| printf("operator: +\n"); | |
| } | |
| if (**ptr == '-') { | |
| *ptr += 1; | |
| read_term(ptr); | |
| printf("operator: -\n"); | |
| } | |
| } | |
| void read_factor(const char **ptr) | |
| { | |
| read_number(ptr); | |
| if (**ptr == '*') { | |
| *ptr += 1; | |
| read_factor(ptr); | |
| printf("operator: *\n"); | |
| } | |
| if (**ptr == '/') { | |
| *ptr += 1; | |
| read_factor(ptr); | |
| printf("operator: /\n"); | |
| } | |
| if (**ptr == '%') { | |
| *ptr += 1; | |
| read_factor(ptr); | |
| printf("operator: %%\n"); | |
| } | |
| } | |
| void read_number(const char **ptr) | |
| { | |
| if (**ptr == '+') { | |
| *ptr += 1; | |
| read_number(ptr); | |
| } else if (**ptr == '-') { | |
| *ptr += 1; | |
| read_number(ptr); | |
| printf("operator: negate\n"); | |
| } else if (**ptr == '(') { | |
| *ptr += 1; | |
| read_term(ptr); | |
| *ptr += 1; | |
| } else { | |
| char number[256]; | |
| { | |
| const char *str = *ptr; | |
| { | |
| size_t i = 0; | |
| while ('0' <= *str && *str <= '9') { | |
| number[i++] = *(str++); | |
| } | |
| number[i] = 0; | |
| } | |
| *ptr = str; | |
| } | |
| printf("number: %s\n", number); | |
| } | |
| } | |
| int main(void) | |
| { | |
| const char *expr = "10*(12+(3*10+4))"; | |
| read_term(&expr); | |
| return (0); | |
| } |
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