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have command to force finish or quit program in C?

i want to write if scanf input !=123ABC
will do next step

what is the write format?

if i go from T to F , then 18-5 = 13. how come give different?

how can i present in C?
i dont understand go right or left

question:

A to Z is a circle, if i start from T ,then want go to F, i want to choose a shorest part. how can i do it .
T>U>V>W>X>W>Z>A>B>C>D>E>F = 12
T>S>R>Q>P>O>N>M>L>K>J>I>H>G>F =14

-_-"

when i type DA it output -3 , how can i change all output to positive number?

thx for help

that means
printf("%c - %c = %d" , first , second , different);
?

seems cant work

that mean i need 'D' - 'A' = 3 change to ASCII code in my program ?

sorry for first post

i want to count the number of alphabet between my input

exmaple : I input AD , i want it show me the answer is 3,since
(A>B>C>D)

i am newbie for C program , pls help