Imagine having strings

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

char* addStrings(char* as, char*bs){
        int aL=strlen(as);
        int bL=strlen(bs);
        if (aL<bL){
                char* temp=bs;
                int tL=bL;
                bs=as;
                bL=aL;
                as=temp;
                aL=tL;
        }
        char* cs = malloc(aL+2);
        cs[aL+1]='\0';
        bool carry = false;
        int bi=bL-1;
        for(int ai=aL-1; ai>=0; ai--,bi--){
                char a=as[ai];
                char b='0';
                if(bi>=0)b=bs[bi];
                char c=a+b-'0';
                if(carry)c++;
                carry=c>'9';
                if(carry)c-=10;
                cs[ai+1]=c;
        }
        if(carry) cs[0]='1';
        else cs[0]='0';
        return cs;
}

int main(int argc, char**args){
        printf("%s + %s = %s\n", args[1] , args[2] , addStrings(args[1] , args[2]));
}

Yeah, but in computing (well, specifically the language this slide is about) they're referred to as integers and not referred to as "whole numbers" or any other synonym. If you're looking up something to do with integers in the documentation, you need to have the word "integer" in your vocabulary as "the" way to refer to numbers without decimal places to find what you're looking for. Same way you need to know "string" instead of "word" or "text field" or "sentence".

Type coercion

Including nothing. Actually, depending on the language, multiple types of nothing (null vs uninitialized)

does it say programming 101 somewhere

I can't let you do that, Dave.