The defendant contends that the trial court erred in not allowing the defendant’s motion for nonsuit after the State had rested and in then allowing the State to reopen its case and introduce evidence of statements made by the defendant at the district court trial.
After the State rested and the motion for nonsuit was denied, the defendant took the stand in his own behalf. “If the defendant introduces evidence, he thereby waives any motion for dismissal . . . which he may have made prior to the introduction of his evidence and cannot urge such prior motion as ground for appeal.” G.S. 15-178. Consequently, the defendant cannot assert the denial of that motion on appeal.
So far as the motion for nonsuit after the defendant’s evidence is concerned, that motion was properly denied. The defendant testified that he was employed; that he had earnings of a specified amount and that he had paid only slightly more than *193$400 fon support since 1967. There was sufficient evidence on each element of the offense charged to submit the case to the jury. .
The defendant’s contention that there was error in allowing the State to reopen its case is without merit. So long as the defendant has an opportunity to offer evidence in rebuttal, the court has discretion to reopen a case for additional testimony up until the jury retires, State v. Anderson, 281 N.C. 261, 188 S.E,. 2d ,336 (1972), and has even been held to have such discretion after the jury has begun its deliberation. State v. Thompson, 19 N.C. App. 693, 200 S.E. 2d 208 (1973).
The defendant contends there was error in allowing Mrs. Perry' to1 testify as to what the defendant had said regarding his employment and earnings in the district court. This was not error: ”
The defendant next asserts that the trial court made sufficient errors in the trial and charge so as to deny the defenciánt a fair, and impartial trial free from prejudicial error. Basically, this contention is in the first part directed toward a numbér of questions asked by the court during the State’s presentation of its case. Our review discloses that the court asked questions dealing with when the defendant left home, how much he had-paid for support since then, whether he sought to see or speak to his children, and what ability the defendant had to make support payments. The defendant contends that questions directed to the defendant’s ability to earn, etc., in 1967 and succeeding years are irrelevant because the time on the warrant reads “on or about the 20th day of August 1971.” This is untenable. The defendant was charged under G.S. 14-322 which specifically states that “such wilful neglect . . . shall constitute a continuing offense . . . . ” Such questions therefore are relevant to the issues to be tried. They clarified the testimony elicited, and promoted a better understanding of it. We have examined the questions propounded by the trial court and find no resulting prejudice or expression of opinion in violation of G.S. 1-180.
Another alleged error was the.refusal by the trial court to allow the defendant to ask questions of. Mrs. Perry concerning a child born prior to her marriage with the defendant for the purpose of impeaching her. This was not error and furthermore the question is not properly reviewable since what the answer to the question would have.Jaeen is not in the record. See State v. Kirby, 276 N.C. 123, 171 S.E. 2d 416 (1970).
*194The defendant contends that there was prejudicial error committed in the charge to the jury because of comments made concerning “abandonment”. In the portion to which the defendant refers, the trial judge was summarizing a contention of the State, that the jury “should find the defendant intentionally left his wife and two children . ” This contention was directed to the issue of wilful neglect and is not such that it would be prejudicial to the defendant.
The defendant further argues that the trial judge erred in failing' to charge the jury on the questions of “reasonable doubt” and “wilfulness”. “ [T] rial judges are not required to define the term ‘beyond a reasonable doubt’ in charging the jury in criminal cases.” State v. Broome, 268 N.C. 298, 299, 150 S.E. 2d 416, 417 (1966). The defendant did not request such an instruction and did not object to its absence until after the jury retired. In like manner, the defendant did not request. an instruction defining “wilfulness”. Without a request, the trial judge was under no obligation to define it. These words are as neárly self-explanatory as any explanation that can be made of them. Consequently, the defendant was not prejudiced.
Having considered the various assignments of error, we conclude that there was no error.
No error.
Judges Parker and Vaughn concur.