Look at your code:
printf("%d+%d+%d=%d",suma);
The format string is
%d+%d+%d=%d
which means that
printf
expects four parameters to follow that: one for each of the
%d
codes in the format specification. You provide only one:
suma
so the compiler is saying "Hey! Where is the rest of it?"
You probably wanted this:
printf("%d+%d+%d=%d", a, b, c, suma);
You should expect to get syntax errors like this every day, probably many times a day while you are coding - we all do regardless of how much experience we have! Sometimes, we misspell a variable, or a keyword; sometimes we forget to close a string or a code block. Sometimes the cat walks over your keyboard and types something really weird. Sometimes we just forget how many parameters a method call needs.
We all make mistakes.
And because we all do it, we all have to fix syntax errors - and it's a lot quicker to learn how and fix them yourself than to wait for someone else to fix them for you! So invest a little time in learning how to read error messages, and how to interpret your code as written in the light of what the compiler is telling you is wrong - it really is trying to be helpful!
So read this:
How to Write Code to Solve a Problem, A Beginner's Guide Part 2: Syntax Errors[
^] - it should help you next time you get a compilation error!