5.9: MIP LANGUAGE: WRITE THE FUNCTION DESCRIBED IN SECTION 5.9 AND A MAIN ROUTINE TO TEST IT.

ied wit the ASCII code for space. Finally, we use the system Ser string in the output buffer. The output buffer size should be limited to no n width which defaults to 80 characters. This l permanent allocation need be made. more than the SU ocal buffer can be allocated on the stack so that no 5.9 A FUNCTION TO READ DECIMAL VALUES AND DETECT ERRORS As was pointed out at the end of Chapter 4, the system service to read an bility of informing the user if the input string does not properly integer has no capa- represent an integer. An ger Read function should return status information to the calling program so that the user can be prompted by the calling program error is detected. odbyte aling rtore-et the value correcty when an imput y, this new input function will use syscall sread string to read a string f ASCIl characters from the keyboard into a buffer, and then return the equivalent 32-bit ry integer value. If the input string can be correctly interpreted as a decimal integer, a ster v1. (The status flag) If the input string cannot be correctly interpreted, then a value of "I" is returned in register v1. In other words, vi will be a flag that bina value of zero is returned in regi indicates if the input value is incorrectly specified. This algorithm consists of three phases. In the first phase, the string is scanned looking for the first digit of the number with the possibility that the Most Significant Digit (MSD) may be preceded by a minus sign. The second phase involves scanning through the following string of characters, and extracting each decimal digit by subtracting out the ASCII bias. When each new decimal digit is found, we multiply our current accumulated value by ten and add the most ied wit the ASCII code for space. Finally, we use the system Ser string in the output buffer. The output buffer size should be limited to no n width which defaults to 80 characters. This l permanent allocation need be made. more than the SU ocal buffer can be allocated on the stack so that no 5.9 A FUNCTION TO READ DECIMAL VALUES AND DETECT ERRORS As was pointed out at the end of Chapter 4, the system service to read an bility of informing the user if the input string does not properly integer has no capa- represent an integer. An ger Read function should return status information to the calling program so that the user can be prompted by the calling program error is detected. odbyte aling rtore-et the value correcty when an imput y, this new input function will use syscall sread string to read a string f ASCIl characters from the keyboard into a buffer, and then return the equivalent 32-bit ry integer value. If the input string can be correctly interpreted as a decimal integer, a ster v1. (The status flag) If the input string cannot be correctly interpreted, then a value of "I" is returned in register v1. In other words, vi will be a flag that bina value of zero is returned in regi indicates if the input value is incorrectly specified. This algorithm consists of three phases. In the first phase, the string is scanned looking for the first digit of the number with the possibility that the Most Significant Digit (MSD) may be preceded by a minus sign. The second phase involves scanning through the following string of characters, and extracting each decimal digit by subtracting out the ASCII bias. When each new decimal digit is found, we multiply our current accumulated value by ten and add the most