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rdp.c
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105 lines (105 loc) · 3.4 KB
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#include <stdio.h>
#include <string.h>
#define SUCCESS 1
#define FAILED 0
int E(), Edash(), T(), Tdash(), F();
const char *cursor;
char string[64];
int main()
{
puts("Enter the string");
scanf("%s", string);
//sscanf("i+(i+i)*i", "%s", string);
cursor = string;
puts("");
puts("Input Action");
puts("--------------------------------");
if (E() && *cursor == '\0') {
puts("--------------------------------");
puts("String is successfully parsed");
return 0;
} else {
puts("--------------------------------");
puts("Error in parsing String");
return 1;
}
}
int E()
{
printf("%-16s E -> T E'\n", cursor);
if (T()) {
if (Edash())
return SUCCESS;
else
return FAILED;
} else
return FAILED;
}
int Edash()
{
if (*cursor == '+') {
printf("%-16s E' -> + T E'\n", cursor);
cursor++;
if (T()) {
if (Edash())
return SUCCESS;
else
return FAILED;
} else
return FAILED;
} else {
printf("%-16s E' -> $\n", cursor);
return SUCCESS;
}
}
int T()
{
printf("%-16s T -> F T'\n", cursor);
if (F()) {
if (Tdash())
return SUCCESS;
else
return FAILED;
} else
return FAILED;
}
int Tdash()
{
if (cursor == '') {
printf("%-16s T' -> * F T'\n", cursor);
cursor++;
if (F()) {
if (Tdash())
return SUCCESS;
else
return FAILED;
} else
return FAILED;
} else {
printf("%-16s T' -> $\n", cursor);
return SUCCESS;
}
}
int F()
{
if (*cursor == '(') {
printf("%-16s F -> ( E )\n", cursor);
cursor++;
if (E()) {
if (*cursor == ')') {
cursor++;
return SUCCESS;
} else
return FAILED;
} else
return FAILED;
} else if (*cursor == 'i') {
cursor++;
printf("%-16s F ->i\n", cursor);
return SUCCESS;
} else
return FAILED;
} RDP