luc098.c (1811B)
1 /* Write a calculator utility using command line arguments.\nUsage: calc <switch> <n> <m>\nwhere switch is arithmetic operator or comparison operator. 2 */ 3 /* Let Us C, Chap- 20 (More Issues In Input/Output), Qn No.: A(d) */ 4 5 /* This file is auto-generated by a bot. */ 6 /* This code is not compiled; it is for reference only. */ 7 8 9 #include <stdio.h> 10 #include <stdlib.h> 11 #include <string.h> 12 #include <ctype.h> 13 14 int main(int argc, char *argv[]) 15 { 16 float n, m, res; 17 char operator; 18 19 if (argc != 4) 20 { 21 printf("Usage: %s <switch> <n> <m>\n", argv[0]); 22 printf("Example: %s + 10 20\n", argv[0]); 23 printf("Note: For multiplication (*), use '*' or x to avoid shell expansion.\n"); 24 exit(1); 25 } 26 27 operator = argv[1][0]; // First character of the switch argument 28 n = atof(argv[2]); 29 m = atof(argv[3]); 30 31 switch (operator) 32 { 33 // Arithmetic 34 case '+': 35 printf("%.2f\n", n + m); 36 break; 37 case '-': 38 printf("%.2f\n", n - m); 39 break; 40 case 'x': 41 case '*': 42 printf("%.2f\n", n * m); 43 break; 44 case '/': 45 if (m == 0) printf("Error: Division by zero\n"); 46 else printf("%.2f\n", n / m); 47 break; 48 case '%': 49 printf("%d\n", (int)n % (int)m); 50 break; 51 52 // Comparison 53 case '<': 54 printf("%s\n", (n < m) ? "True" : "False"); 55 break; 56 case '>': 57 printf("%s\n", (n > m) ? "True" : "False"); 58 break; 59 60 // Handling symbols that might be multi-char (e.g. <=, >=, ==) is tricky 61 // with argv[1][0], but basic logic for typical single char switches: 62 case '=': 63 printf("%s\n", (n == m) ? "True" : "False"); 64 break; 65 66 default: 67 printf("Unknown operator: %c\n", operator); 68 break; 69 } 70 71 return 0; 72 }