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Write a function to calculate the exchange rate of pounds to dollars
Answer
Td = 2xTp The parameter passed over is the number of pounds and returned the value in dollars
float convert (float x ) { float y ; /*A function which converts pounds measure X to a dollars measure*/ /*The parameter x is real and a real value y is returned*/ y = 2.0 * x; return (y); } The program which calls the function would be include include include include include void main() { char prompt; float a, b; printf("please enter in your value in pounds \n\r"); scanf("%f",&a); b= convert(a); printf("The value in dollars is %5.3f \n\r",b); b= convert(3.0); printf("The value in dollars of 3 pounds is %5.3f \n\r",b); printf("Press any key to exit \n\r"); scanf("\n%c",&prompt); }
Here the program requests the value of a in pounds, then executes function 'Convert'. This causes the program to go to the function statement, pass the variable a, to it and the output is passed back to the program. The output is then assigned to variable b and printed out. It is possible to pass a value over instead of a variable. The only amendment we have to make is to add the prototype to the program i.e.
float convert (float); This describes the type of variables passed to and from the function. Therefore the complete program and function is shown below include include include include include float convert (float); void main() { char prompt; float a, b; printf("please enter in your in pounds \n\r"); scanf("%f",&a); b= convert(a); printf("The value in dollars is %5.3f \n\r",b); b= convert(3.0); printf("The value in dollars of 3 pounds is %5.3f \n\r",b); printf("Press any key to exit \n\r"); scanf("\n%c",&prompt); } float convert (float x ) { float y ; /*A function which converts pounds measure X to a dollars measure*/ /*The parameter x is real and a real value y is returned*/ y = 2.0 * x; return (y); }
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