Mohammad Fayaz Roll No.: Ap21110011426 Implementation of Lexical Analyzer using c-programming. Program Code
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- Input file content: int main() { double x = 3 ; int y = 5 ; long sum = x + y ; return 0 ; } Output
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Compiler Design Lab Assignment-01 Name: Mohammad Fayaz Roll No.: AP21110011426 Implementation of Lexical Analyzer using C-Programming. Program Code: #include #include #include #include int isKeyword(char b[]) { char keywords[32][10] = {"auto", "break", "case", "char", "const", "continue", "default", "do", "double", "else", "enum", "extern", "float", "for", "goto", "if", "int", "long", "register", "return", "short", "signed", "sizeof", "static", "struct", "switch", "typedef", "union", "unsigned", "void", "volatile", "while"}; int i, flag = 0; for (i = 0; i < 32; ++i) { if (strcmp(keywords[i], b) == 0) { flag = 1; break; } } return flag; } int main() { char ch, prev = '\0'; char b[15], oper[] = "+-*/%=<>"; FILE *fp; int i, j = 0; fp = fopen("test.txt", "r"); if (fp == NULL) { printf("error while opening the file\n"); exit(0); } while ((ch = fgetc(fp)) != EOF) { for (i = 0; i < 6; ++i) { if (ch == oper[i]) printf("%c is operator\n", ch); } if (isdigit(ch)) { b[j++] = ch; b[j] = '\0'; printf("%s is constant\n", b); j = 0; } else if (isalpha(ch)) { b[j++] = ch; } else if ((ch == ',' || ch == ';' || ch == '(' || ch == ')' || ch == ']' || ch == '[' || ch == '{' || ch == '}' || ch == '\"' || ch == '\'' || ch==':' || ch=='.') && ch != prev) { printf("%c is delimiter\n", ch); prev = ch; } else if ((ch == ' ' || ch == '\n') && (j != 0)) { b[j] = '\0'; j = 0; if (isKeyword(b) == 1) printf("%s is keyword\n", b); else printf("%s is identifier\n", b); } } fclose(fp); return 0; } Input file content: int main() { double x = 3 ; int y = 5 ; long sum = x + y ; return 0 ; } Output: int is keyword ( is delimiter ) is delimiter main is identifier { is delimiter double is keyword x is identifier = is operator 3 is constant ; is delimiter int is keyword y is identifier = is operator 5 is constant long is keyword sum is identifier = is operator x is identifier + is operator y is identifier return is keyword 0 is constant } is delimiter Download 16.33 Kb. Share with your friends:
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