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    <p>The problem occurs because you use pointers in <code>NSInteger</code> and <code>float</code>. I have modified your method with the implementation for both cm and inches, as follows:</p> <pre><code>- (NSString *)returnRightMetric:(NSString *)theMeasure typeOfMetricUsed:(NSString *)metricType { NSString *result = nil; if ([metricType isEqualToString:@"inches"]) { NSArray* theConvertion = [theMeasure componentsSeparatedByCharactersInSet: [NSCharacterSet characterSetWithCharactersInString:@"’”"]]; NSInteger value1 = [theConvertion[0] intValue]; NSInteger value2 = [theConvertion[1] intValue]; float number = ((value1 * 12) + value2) * 2.54; result = [NSString stringWithFormat:@"%.02f cm", round(number * 100.0) / 100.0]; } else if ([metricType isEqualToString:@"cm"]) { float value = [theMeasure floatValue]; float number = value / 2.54; if (number &gt; 12.0) { result = [NSString stringWithFormat:@"%i’%i”", (int)floor(number / 12.0), (int)number % 12]; } else { result = [NSString stringWithFormat:@"0’%i”", (int)round(number)]; } } NSLog(@"result: %@", result); return result; } </code></pre> <p>Some Test:</p> <pre><code>[self returnRightMetric:@"5’11”" typeOfMetricUsed:@"inches"]; [self returnRightMetric:@"180.34 cm" typeOfMetricUsed:@"cm"]; [self returnRightMetric:@"0’11”" typeOfMetricUsed:@"inches"]; [self returnRightMetric:@"27.94 cm" typeOfMetricUsed:@"cm"]; </code></pre> <p>The output:</p> <pre><code>result: 180.34 cm result: 5’11” result: 27.94 cm result: 0’11” </code></pre>
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