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May 4th, 2023

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#include <stdio.h>
#include <stdlib.h>
void main()
{
char str[100]; /* Declares a string of size 100 */
int l = 0;
int z = 1;
int i;
printf("\n\nLEXICAL ANALYZER :\n");
printf("------------------------------------------------------\n");
printf("Input the equation : ");
fgets(str, sizeof str, stdin);
printf("TOKENS : \n");
int c = strlen(str);
for (l=0;l<c-1;l++)
{
if (str[l] == 'a' || str[l] == 'b' || str[l] == 'c' || str[l] == 'e' ||str[l] == 'f' ||str[l] == 'g' ||str[l] == 'h' ||str[l] == 'i' ||str[l] == 'j' ||str[l] == 'k' ||str[l] == 'd' ||str[l] == 'm')
{
printf("%c is ", str[l]);
printf("ID%d\n",z);
//l++;
z++;
}
else if (str[l] == '*'){
printf("%c is ", str[l]);
printf("multiplication\n");
//l++;
}
else if (str[l] == '+'){
printf("%c is ", str[l]);
printf("addition\n");
//l++;
}
else if (str[l] == '/'){
printf("%c is ", str[l]);
printf("division\n");
//l++;
}
else if (str[l] == ':'){
printf("%c%c is ", str[l],str[l+1]);
printf("AOP\n");
l++;
}
else if (str[l] == '-'){
printf("%c is ", str[l]);
printf("subtraction\n");
//l++;
}
else if (str[l] == '*'){
printf("%c is ", str[l]);
printf("exponent\n");
// l++;
}
else{
printf("%c is ", str[l]);
printf("Constant\n");
//l++;
}
}
printf("\n");
}

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