check if character in array c code example

Example 1: check if string in string c

if(strstr(sent, word) != NULL) {
    /* ... */
}

Example 2: c check if char is an operator

char o = '+';	//Or some other character

if (o == '%' || o == '/' || o == '*' || o == '+' || o == '-') {
	//Do something
    //...
}