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About C basics....!

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Hallo every body. I am a beginer in the field of programing and hence asking here a very basic problem in C language. Please forgive me if this question looks you to be stupid. Here is my problem... Any function returns a value to another function which have called it, eg. Look at the following simple program- main() { int a, fact; printf("\nEnter any number"); scanf("%d",&a); fact= factorial(a); printf("Factorial Value= %d", fact); } factorial(int x) { int f=1, i; for(i=x;i>=1;i--) f= f*i; return(f); } In this program, We have used a user defined function 'factorial'. The statement 'return(f)' tells the compiler to return the value of variable 'f' to the function 'main'. 'main' is also a function, which also must return a value to something. This is my question that to whom the function 'main' returns value. If it is the O/S, then what the O/S does with this value? Further, we use a keyword 'void' before the function 'main' to tell the compiler to not to return any value by the function 'main'. What does this all mean???

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