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#include <stdio.h> #include <ctype.h> #include <string.h>
#define ID 10 #define NUM 20
char key[6][10] = {"main", "int", "char", "if", "else", "while"}; char TOKEN[20];
FILE *fp;
int lookup(char *token) { for (int i = 0; i < 6; ++i) { if (!strcmp(token, key[i])) return i + 1; } return 0; }
void out(int id, char *token) { printf("种别码:%d 单词符号:%s \n", id, token); fputs("种别码:", fp); fprintf(fp, "%d", id); fputs(" 单词符号:", fp); fputs(token, fp); fputs("\n", fp);
}
void scanner(FILE *fp) { char ch; int i, c; while (ch != EOF) { ch = fgetc(fp); if (isalpha(ch)) { TOKEN[0] = ch; ch = fgetc(fp); i = 1; while (isalnum(ch)) { TOKEN[i] = ch; i++; ch = fgetc(fp); } TOKEN[i] = '\0'; fseek(fp, -1, 1); c = lookup(TOKEN); if (c == 0) out(ID, TOKEN); else out(c, TOKEN); } else { if (isdigit(ch)) { TOKEN[0] = ch; ch = fgetc(fp); i = 1; while (isdigit(ch)) { TOKEN[i] = ch; i++; ch = fgetc(fp); } TOKEN[i] = '\0'; fseek(fp, -1, 1); out(NUM, TOKEN); } else { switch (ch) { case ' ': break; case '\n': break; case '\t': break; case EOF: break; case '+': out(22, "+"); break; case '-': out(23, "-"); break; case '*': out(24, "*"); break; case '/': out(25, "/"); break; case ';': out(31, ";"); break; case ',': out(30, ","); break; case '{': out(28, "{"); break; case '}': out(29, "}"); break; case '(': out(26, "("); break; case ')': out(27, ")"); break; case '<': ch = fgetc(fp); if (ch == '=')out(35, "<="); else { fseek(fp, -1, 1); out(33, "<"); } break; case '>': ch = fgetc(fp); if (ch == '=')out(34, ">="); else { fseek(fp, -1, 1); out(32, ">"); } break; case '=': ch = fgetc(fp); if (ch == '=')out(36, "=="); else { fseek(fp, -1, 1); out(21, "="); } break; case '!': ch = fgetc(fp); if (ch == '=')out(37, "!="); else out(-1, "Wrong!"); break; default: out(-1, "Wrong!"); break; } } } } }
int main() { FILE *fileP; fileP = fopen("D:\\OneDrive\\Personal\\OneDrive\\JetBrains\\CTemp\\Scanner\\test.txt", "r"); fp = fopen("D:\\OneDrive\\Personal\\OneDrive\\JetBrains\\CTemp\\Scanner\\Answer.txt", "w+"); scanner(fileP); fclose(fp); fclose(fileP); return 0; }
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