Writing your apps in C is within the terms of the agreement. As is writing your code in Javascript if it is interpreted by Webkit, which is why _Phone Gap_ see

Writing your apps in C is within the terms of the agreement. As is writing your code in Javascript if it is interpreted by Webkit, which is why _Phone Gap_ seems to be okay. "...Applications must be originally written in Objective-C, C, C++, or JavaScript as executed by the iPhone OS WebKit engine, and only code written in C, C++, and Objective-C may compile and directly link against the Documented APIs..."