The Parsing function

void update_lhs(void)

{

char *next = buffer, *last;

char op[10], numStr[20];

int num;

int temp = lhs;

last = next + strlen(buffer);

while (next < last) {

if ( sscanf(next, "%s %s", op, numStr) < 2 ||

strlen(op) != 1 ||

bad_op(op[0]) )

return;

if (Stop == op[0] ) {

printf(" *** End of Calculation ***\n\n");

exit(EXIT_SUCCESS);

}

num = atoi(numStr);

switch(op[0]) {

case '+': temp += num; break;

case '-': temp -= num; break;

case '*': temp *= num; break;

case '/': temp /= num; break;

case '%': temp %= num; break;

}

next += strlen(op) + strlen(numStr) + 2;

}

lhs = temp;

}

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