Argument:An argument is an expression which is passed to a function by its caller (or macro by its invoker) in order for the function(or macro) to perform its task. It is an expression in the comma-separated list bound by the parentheses in a function call expression.Actual arguments:The arguments that are passed in a function call are called actual arguments. These arguments are defined in the calling function.Formal arguments:The formal arguments are the parameters/arguments in a function declaration. The scope of formal arguments is local to the function definition in which they are used. Formal arguments belong to the called function. Formal arguments area copy of the actual arguments. A change in formal arguments would not be reflected in the actual arguments.Example:#include <stdio.h>void sum(int i, int j, int k);/* calling function */int main() {int a = 5; // actual argumentssum(3, 2 * a, a);return 0;} /* called function *//* formal arguments*/void sum(int i, int j, int k) {int s;s = i + j + k;printf("sum is %d", s);}Here 3, 2*a, a are actual arguments and i,j,k are formal arguments. Read more about actual arguments vs formal arguments. C
Topic: Memory Allocation
What are the differences between formal arguments and actual arguments?
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