Checking the return value of a C program in a bash script?

I have a bash script in which i check the exit code of a last run command by using $? variable but now I am executing a C program (from that script) which returns 0 if the program gets executed successfully. Is there any way I can catch this return value of the C program from with in my bash script? I believe different commands like awk, sed etc are written in C. How do they use $? to store their exit codes in it? How can I make my C program to store its exit code in $?? I hope my question is clear.

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