How to round of the value? [duplicate]

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Possible Duplicate:

Objective-c: How to round off Float values?

I wanted to roundoff the float value from 42.56789 to 42.6. Can any one help me out in this.

Thanks in advance

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There are two functions in c namely floor and ceil to roundoff the float values.

Refer Wikipedia reference

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float value=42.56789;
NSString *roundedValue=[NSString stringWithFormat:@"%0.f",value];
NSLog(@"%@",roundedValue);

It prints 43 on console.

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float f = 42.56789;

    f *= 10.0f;

    f = ceilf(f);

    f /= 10.0f;

    NSLog(@"%.02f",f);

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I have done it manually .

float val=42.567890// float gives 6 decimal places
int x=(int) val;
float f=val-(int)val;
int o=(int) f*10;
float round=x+o/10+(f-(o/10))*1000)/50;