diff options
author | sinanmohd <pcmsinan@gmail.com> | 2022-06-15 10:50:11 +0530 |
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committer | sinanmohd <pcmsinan@gmail.com> | 2022-06-15 10:50:11 +0530 |
commit | b9b7a4ef7ee071edd7a07788a62f6d81871dfb19 (patch) | |
tree | 647f89f715cbb722220c9f711e57bc2d99f2e88a /4.11.c | |
parent | ef97b19c7f37af3d7cdedd0a8a2b98edaa48e838 (diff) |
add qsort and 4.11
Diffstat (limited to '4.11.c')
-rw-r--r-- | 4.11.c | 113 |
1 files changed, 113 insertions, 0 deletions
@@ -0,0 +1,113 @@ +#include <stdio.h> +#include <stdlib.h> +#include <ctype.h> +#include <math.h> + +#define MAXOP 100 +#define NUMBER_SIG '0' + +double pop(void); +void push(double f); +char getop(char str[]); + +int +main(void) +{ + char str[MAXOP]; + char type; + double op2; + + while ((type = getop(str)) != EOF) { + switch (type) { + case NUMBER_SIG : + push(atof(str)); + break; + case '+' : + push(pop() + pop()); + break; + case '*' : + push(pop() * pop()); + break; + case '-' : + op2 = pop(); + push(pop() - op2); + break; + case '/' : + if ((op2 = pop()) == 0.0) + printf("Err: deviser cant be zero\n"); + else + push(pop() / op2); + + break; + case '%' : + op2 = pop(); + if (op2 != 0) + push(fmod(pop(), op2)); + else + printf("Err: deviser cant be zero\n"); + + break; + case '\n' : + printf("%.8g\n", pop()); + break; + default : + printf("Err: unknown command\n"); + } + } + + return 0; +} + +#define MAXVAL 100 +double val[MAXVAL]; +int sp = 0; + +double +pop(void) +{ + if (sp > 0) + return val[--sp]; + else { + printf("Err: stack empty\n"); + return 0.0; + } +} + +void +push(double f) +{ + if (sp < MAXVAL) + val[sp++] = f; + else + printf("Err: stack is full\n"); +} + + +char +getop(char str[]) +{ + static char buff = ' '; + char input; + int i; + + /* ignore blanks */ + for (input = buff, str[0] = buff; isblank(input);) + input = str[0] = getchar(); + + buff = ' '; + + /* return operator */ + if (!isdigit(input) && input != '.') + return input; + + /* collect digits*/ + for (i = 1; i < MAXOP && (isdigit(input=getchar()) || input == '.'); i++) + str[i] = input; + + str[i] = '\0'; + + if (input != EOF) + buff = input; + + return NUMBER_SIG; +} |